AMAZING HUMAN FACTS

Stomach lining cells produce mucus, pepsin, HCl to a pH of 2.0 (100,000X the acidity of your bloodstream)

More than half the bones in the human body are in the hands and feet.

The highest recorded "sneeze speed" is 165 km (102 miles) per hour.

The heart beats about 3 billion times in the average person's lifetime.

A newborn baby has 350 bones, but a fully-grown adult has only 206.

Blood is a liquid organ.

Everyone is colorblind at birth.

Our lungs inhale over two million liters of air every day, without even thinking. The surface area of the lungs is approximately the same size as a tennis court.

Food will get to your stomach even if you're standing on your head.

Skin is the largest body organ.

The average adult is made up of 100 trillion cells.

There are more bacteria in your body than the number of cells in your body. There are an estimated 75 to 100 trillion cells in the human body.

Our brain is more complex than the most powerful computer and has over 100 billion nerve cells.

Capillaries are so small that red blood cells can only travel through them in single file.

The cornea, the outermost layer of the eye, is the only living tissue in the human body without blood vessels? It receives nutrients from tears and from the aqueous humor.

Each cell in your body has an estimated 6 to 8 feet of DNA.

Research has shown that guilt damages your immune system by lowering your immunoglobulin levels.


The total length of your circulatory system stretches an amazing 60,000 miles. That is more than twice the distance around the Earth.

In one square inch of skin there are four yards of nerve fibers, 600 pain sensors, 1300 nerve cells, 9000 nerve endings, 36 heat sensors, 75 pressure sensors, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.

Except for your brain cells, 50,000,000 of the cells in your body will have died and been replaced with others, all while you have been reading this sentence.

Your heart beats about 100,000 times in one day and about 40,000,000 times a year. In one hour the heart works hard enough to produce enough energy to raise almost one ton of weight one yard from the ground.


The liver is often called the body's chemical factory. Scientists have counted over 500 liver functions.

The central nervous system is connected to every part of the body by 43 pairs of nerves. Twelve pairs go to and from the brain, with 31 pairs going from the spinal cord. There are nearly 45 miles of nerves running through our bodies.

Messages travel along the nerves as electrical impulses. They travel at speeds up to 248 mile per hour.

The central nervous system is the master system of all functions within your body and has a reciprocal Neurophysiologic relationship with the Acupressure Meridian and Chakra (Emotional Energy Centers) Systems of energetic function within your being. Subluxations in your spine, cranium and extremities, interfere with the flow of nerve impulse energy information and acupressure meridian energy within your body.

The aorta, the largest artery in the body, is almost the diameter of a garden hose. Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair.

Your body has about 5.6 liters (6 quarts) of blood. These 5.6 liters of blood circulates through the body three times every minute. In one day, the blood travels a total of 19,000 km (12,000 miles) - that's four times the distance across the US from coast to coast.


Our eyes can distinguish up to one million color surfaces and take in more information than the largest telescope known to man.


Our hearing is so sensitive it can distinguish between hundreds of thousands of different sounds.


Our sense of touch is more refined than any device ever created.

We give birth to 100 billion red blood cells every day and about two million red blood cells every second.


When we touch something, we send a message to our brain at 124 mph.

We have over 600 muscles.

We exercise at least 30 muscles when we smile.

We are about 70 percent water.

We make one liter of saliva a day.

Our nose is our personal air-conditioning system: it warms cold air, cools hot air and filters impurities.

We have copper, zinc, cobalt, calcium, manganese, phosphates, nickel and silicon in our bodies.

If you yelled for 8 years, 7 months and 6 days you would have produced enough sound energy to heat one cup of coffee.

During the first month of life, the number of connections or synapses, dramatically increases from 50 trillion to 1 quadrillion. If an infant's body grew at a comparable rate, his weight would increase from 8.5 pounds at birth to 170 pounds at one month old.

The average life of a taste bud is 10 days.

Margarine is but ONE MOLECULE away from being PLASTIC...

Our bodies contain enough water to fill a ten-gallon tank.

We have enough carbon to manufacture 900 pencils.

Fingernails are one of the human body's strongest components. They contain keratin, which is also found in rhino horns, which refuses to erode after death.

Babies are not fully naked in the womb. In fact, their entire bodies are usually covered in a thin layer of dark hair by the end of the fifth month of pregnancy, which disappear when the baby is born.

People blink once every four seconds. That's because the eyelashes act as windscreen wipers, keeping dust and grime from getting into the eye itself.

Humans are one of the only mammals who are unable to 'turn' their ears in order to hear approaching predators.

An embryo is genderless for the first 6-8 weeks of pregnancy. Only after that the body decides whether the baby will be a boy or girl through dominant hormones that emerge.

Every tongue has its own individual print, which is unique to each person.

The big toe is actually one of the most important elements within the body, as it balances the skeleton and enables the owner to move forward when walking without it, we would simply fall over.

If the population of China walked by you in single file the line would never end because of the rate of reproduction.

If a person has two-thirds of their liver removed from trauma or surgery, it will grow back to its original size in four weeks time.

On average, you breathe 23,000 times a day. You take about 600 million breaths during your lifetime.

A person can live without food for about 40 days, but only about 7 days without water, 6-8 minutes without air, and literally an instant without Life Force.

Among the top ten causes of death in the US are toxic reactions to correctly prescribed drugs, which make more than two million Americans seriously ill every year, and kill 106,000 more. Incorrectly prescribed drugs account for another 90,000 deaths each year!

The odds of being struck by lightning are about 600,000 to one.

It is normal to lose 100 hairs per day from the scalp.

We take about 600 million breaths during our lifetime.

There are more bacteria in your mouth than the human population of US and Canada combined.

There are more than 1,000 chemicals in a cup of coffee. Of these, only 26 have been tested, and half caused cancer in rats.

The average human body contains enough: Sulfur to kill all fleas on an average dog, Carbon to make 900 pencils, Potassium to fire toy cannon, Fat to make 7 bars of soap, Phosphorus to make 2,200 match heads, and enough water to fill a ten gallon tank.

If you could save all the times your eyes blink in one lifetime and use them all at once you would see blackness for 1.2 years!


Fact: In one square inch of skin there are four yards of nerve fibers, 1300 nerve cells, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.

Fact: Except for your brain cells, 50,000,000 of the cells in your body will have died and been replaced with others, all while you have been reading this sentence.

Fact: The adult heart beats about 40,000,000 times a year. In one hour the heart works hard enough to produce enough energy to raise almost one ton of weight one yard from the ground.

Fact: The liver is often called the body's chemical factory. Scientists have counted over 500 liver functions.

Fact: The central nervous system is connected to every part of the body by 43 pairs of nerves. Twelve pairs go to and from the brain, with 31 pairs going from the spinal cord. There are nearly 45 miles of nerves running through our bodies.

Fact: Messages travel along the nerves as electrical impulses. They travel at speeds up to 248 mile per hour.

Sixty Amazing-but-True Facts!

In the weightlessness of space a frozen pea will explode if it comes in contact with Pepsi.

The increased electricity used by modern appliance parts is causing a shift in the Earth's magnetic field. By the year 2327, the North Pole will be located in mid-Kansas, while the South Pole will be just off the coast of East Africa.

The idea for "tribbles" in "Star Trek" came from gerbils, since some gerbils are actually born pregnant.

Male rhesus monkeys often hang from tree branches by their amazing prehensile penises.

Johnny Plessey batted .331 for the Cleveland Spiders in 1891, even though he spent the entire season batting with a rolled-up, lacquered copy of the Toledo Post-Dispatch.

Smearing a small amount of dog feces on an insect bite will relieve the itching and swelling.

The Boeing 747 is capable of flying upside-down if it weren't for the fact that the wings would shear off when trying to roll it over.

The trucking company Elvis Presley worked at as a young man was owned by Frank Sinatra.

The only golf course on the island of Tonga has 15 holes, and there's no penalty if a monkey steals your golf ball.

Legislation passed during WWI making it illegal to say "gesundheit" to a sneezer was never repealed.

Manatees possess vocal chords which give them the ability to speak like humans, but don't do so because they have no ears with which to hear the sound.

SCUBA divers cannot pass gas at depths of 33 feet or below.

Catfish are the only animals that naturally have an ODD number of whiskers.

Replying more than 100 times to the same piece of spam e-mail will overwhelm the sender's system and interfere with their ability to send any more spam.

Polar bears can eat as many as 86 penguins in a single sitting.

The first McDonald's restaurant opened for business in 1952 in Edinburgh, Scotland, and featured the McHaggis sandwich.

The Air Force's F-117 fighter uses aerodynamics discovered during research into how bumblebees fly.

You *can* get blood from a stone, but only if contains at least 17 percent bauxite.

Silly Putty was "discovered" as the residue left behind after the first latex condoms were produced. It's not widely publicized for obvious reasons.

Approximately one-sixth of your life is spent on Wednesdays.

The skin needed for elbow transplants must be taken from the scrotum of a cadaver.

The sport of jai alai originated from a game played by Incan priests who held cats by their tails and swung at leather balls. The cats would instinctively grab at the ball with their claws, thus enabling players to catch them.

A cat's purr has the same romance-enhancing frequency as the voice of singer Barry White.

The typewriter was invented by Hungarian immigrant Qwert Yuiop, who left his "signature" on the keyboard.

The volume of water that the Giant Sequoia tree consumes in a 24-hour period contains enough suspended minerals to pave 17.3 feet of a 4-lane concrete freeway.

King Henry VIII slept with a gigantic axe.

Because printed materials are being replaced by CD-ROM, microfiche and the Internet, libraries that previously sank into their foundations under the weight of their books are now in danger of collapsing in extremely high winds.

In 1843, a Parisian street mime got stuck in his imaginary box and consequently died of starvation.

Touch-tone telephone keypads were originally planned to have buttons for Police and Fire Departments, but they were replaced with * and # when the project was cancelled in favor of developing the 911 system.

Human saliva has a boiling point three times that of regular water.

Calvin, of the "Calvin and Hobbes" comic strip, was patterned after President Calvin Coolidge, who had a pet tiger as a boy.

Watching an hour-long soap opera burns more calories than watching a three-hour baseball game.

Until 1978, Camel cigarettes contained minute particles of real camels.

You can actually sharpen the blades on a pencil sharpener by wrapping your pencils in aluminum foil before inserting them.

To human taste buds, Zima is virtually indistinguishable from zebra urine.

Seven out of every ten hockey-playing Canadians will lose a tooth during a game. For Canadians who don't play hockey, that figure drops to five out of ten.

A dog's naked behind leaves absolutely no bacteria when pressed against carpet.

A team of University of Virginia researchers released a study promoting the practice of picking one's nose, claiming that the health benefits of keeping nasal passages free from infectious blockages far outweigh the negative social connotations.

Among items left behind at Osama bin Laden's headquarters in Afghanistan were 27 issues of Mad Magazine. Al Qaeda members have admitted that bin Laden is reportedly an avid reader.

Urine from male cape water buffaloes is so flammable that some tribes use it for lantern fuel.

At the first World Cup championship in Uruguay, 1930, the soccer balls were actually monkey skulls wrapped in paper and leather.

Every Labrador retriever dreams about bananas.

If you put a bee in a film canister for two hours, it will go blind and leave behind its weight in honey.

Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.

Never hold your nose and cover your mouth when sneezing, as it can blow out your eyeballs.

Centuries ago, purchasing real estate often required having one or more limbs amputated in order to prevent the purchaser from running away to avoid repayment of the loan. Hence an expensive purchase was said to cost "an arm and a leg."

When Mahatma Gandhi died, an autopsy revealed five gold Krugerrands in his small intestine.

Aardvarks are allergic to radishes, but only during summer months.

Coca-Cola was the favored drink of Pharaoh Ramses. An inscription found in his tomb, when translated, was found to be almost identical to the recipe used today.

If you part your hair on the right side, you were born to be carnivorous. If you part it on the left, your physical and psychological make-up is that of a vegetarian.

When immersed in liquid, a dead sparrow will make a sound like a crying baby.

In WWII the US military planned to airdrop over France propaganda in the form of Playboy magazine, with coded messages hidden in the models' turn-ons and turn-offs. The plan was scrapped because of a staple shortage due to rationing of metal.

Although difficult, it's possible to start a fire by rapidly rubbing together two Cool Ranch Doritos.

Napoleon's favorite type of wood was knotty chestnut.

The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.

Due to the natural "momentum" of the ocean, saltwater fish cannot swim backwards.

In ancient Greece, children of wealthy families were dipped in olive oil at birth to keep them hairless throughout their lives.

It is nearly three miles farther to fly from Amarillo, Texas to Louisville, Kentucky than it is to return from Louisville to Amarillo.

The "nine lives" attributed to cats is probably due to their having nine primary whiskers.

The original inspiration for Barbie dolls comes from dolls developed by German propagandists in the late 1930s to impress young girls with the ideal notions of Aryan features. The proportions for Barbie were actually based on those of Eva Braun.

The Venezuelan brown bat can detect and dodge individual raindrops in mid-flight, arriving safely back at his cave completely dry.

50 Incredibly Weird Facts About the Human Body

As long as we make efforts to take care of ourselves and live healthy, there is a good chance that our bodies will serve us well for a long time. Our bodies truly are amazing. You might be surprised at what your body is capable of after reading these 50 weird facts about the human body:

The Brain
Complex and poorly understood, the brain is what makes everything work properly. The body may be kept alive, but without the brain, a person can’t truly live. Here are some interesting and weird facts about the brain.

The brain doesn’t feel pain: Even though the brain processes pain signals, the brain itself does not actually feel pain.

Your brain has huge oxygen needs: Your brain requires 20 percent of the oxygen and calories your body needs — even though your brain only makes up two percent of your total body weight.

80% of the brain is water: Instead of being relatively solid, your brain 80% water. This means that it is important that you remain properly hydrated for the sake of your mind.

Your brain comes out to play at night: You’d think that your brain is more active during the day, when the rest of your body is. But it’s not. Your brain is more active when you sleep.

Your brain operates on 10 watts of power: It’s true: The amazing computational power of your brain only requires about 10 watts of power to operate.

A higher I.Q. equals more dreams: The smarter you are, the more you dream. A high I.Q. can also fight mental illness. Some people even believe they are smarter in their dreams than when they are awake.

The brain changes shapes during puberty: Your teenage years do more than just change how you feel; the very structure of your brain changes during the teen years, and it even affects impulsive, risky behavior.

Your brain can store everything: Technically, your brain has the capacity to store everything you experience, see, read or hear. However, the real issue is recall — whether you can access that information.

Information in your brain travels at different speeds: The neurons in your brain are built differently, and information travels along them at different speeds. This is why sometimes you can recall information instantly, and sometimes it takes a little longer.

Your Senses
You might be surprised at the amazing things your various senses can accomplish.

Your smell is unique: Your body odor is unique to you — unless you have an identical twin. Even babies recognize the individual scents of their mothers.

Humans use echolocation: Humans can use sound to sense objects in their area using echolocation. It is thought that those who are blind develop this ability to heightened effectiveness.

Adrenaline gives you super strength: Yes, with the proper response in certain situations, you really can lift a car.

Women smell better than men: Women are better than men at identifying smells.

Your nose remembers 50,000 scents: It is possible for your nose to identify and remember more than 50,000 smells.

Your hearing decreases when you overeat: When you eat too much food, it actually reduces your ability to hear. So consider eating healthy — and only until you are full.

Your sense of time is in your head: How you experience time is all about your perception. Some speculate that stress can help you experience time dilation. Apparently, time manipulation isn’t just for superheroes.

Reproduction
How we as a species reproduce offers all sorts of interesting weird facts. Here are some of the weirder things you might not know.

Your teeth are growing before birth: Even though it takes months after you are born to see teeth, they start growing about six months before you are born.

Babies are stronger than oxen: On a pound for pound basis, that is. For their size, babies are quite powerful and strong.

Babies always have blue eyes when they are born: Melanin and exposure to ultraviolet light are needed to bring out the true color of babies’ eyes. Until then they all have blue eyes.

Women might be intrinsically bi: There are sex studies that indicate that women might bisexual intrinsically, no matter how they class themselves, while men are usually either gay or straight.

Most men have regular erections while asleep: Every hour to hour and a half, sleeping men have erections — though they may not be aware of it.

Sex can be a pain reliever: Even though the “headache” excuse is often used to avoid sex, the truth is that intercourse can provide pain relief. Sex can also help you reduce stress.

Chocolate is better than sex: In some studies, women claim they would rather have chocolate than sex.

But does it really cause orgasm? Probably not on its own.

Body Functions
The things our bodies do are often strange and sometimes gross. Here are some weird facts about the way your body functions.

Earwax is necessary: If you want healthy ears, you need some earwax in there.

Your feet can produce a pint of sweat a day: There are 500,000 (250,000 for each) sweat glands in your feet, and that can mean a great deal of stinky sweat.

Throughout your life, the amount of saliva you have could fill two swimming pools: Since saliva is a vital part of digestion, it is little surprise that your mouth makes so much of it.

A full bladder is about the size of a soft ball: When your bladder is full, holding up to 800 cc of fluid, it is large enough to be noticeable.

You probably pass gas 14 times a day: On average, you will expel flatulence several times as part of digestion.

A sneeze can exceed 100 mph: When a sneeze leaves your body, it does so at high speeds — so you should avoid suppressing it and causing damage to your body.

Coughs leave at 60 mph: A cough is much less dangerous, leaving the body at 60 mph. That’s still highway speed, though.

Musculoskeletal System
Find out what you didn’t know about your muscles and bones.

Bones can self-destruct: It is possible for your bones to destruct without enough calcium intake.

You are taller in the morning: Throughout the day, the cartilage between your bones is compressed, making you about 1 cm shorter by day’s end.

1/4 of your bones are in your feet: There are 26 bones in each foot, meaning that the 52 bones in account for 25 percent of your body’s 206 bones.

It takes more muscles to frown than to smile: Scientists can’t agree on the exact number, but more muscles are required to frown than to smile.

When you take a step, you are using up to 200 muscles: Walking uses a great deal of muscle power — especially if you take your 10,000 steps.

Your tongue is the strongest muscle in your body: Compared to its size, the tongue is the strongest muscle. But I doubt you’ll be lifting weights with it.

Bone can be stronger than steel: Once again, this is a pound for pound comparison, since steel is denser and has a higher tensile strength.

Unnecessary Body Parts
We have a number of body parts that are, well, useless. Here are some facts about the body parts we don’t actually need.

Coccyx: This collection of fused vertebrae have no purpose these days, although scientists believe it’s what’s left of the mammal tail humans used to have. It may be useless, but when you break your coccyx, it’s still painful.

Pinkie toe: There is speculation that since we no longer have to run for our dinner, and we wear sneakers, the pinkie toe’s evolutionary purpose is disappearing — and maybe the pinkie itself will go the way of the dodo.

Wisdom teeth: This third set of molars is largely useless, doing little beyond crowding the mouth and sometimes causing pain.

Vomeronasal organ: There are tiny (and useless) chemoreceptors lining the inside of the nose.

Most body hair: While facial hair serves some purposes, the hair found on the rest of body is practically useless and can be removed with few ill effects.

Female vas deferens: A cluster of dead end tubules near the ovaries are the remains of what could have turned into sperm ducts.

Male Uterus: Yeah, men have one too — sort of. The remains of this undeveloped female reproductive organ hangs on one side of the male prostate gland

Appendix: Yep, your appendix is basically useless. While it does produce some white blood cells, most people are fine with an appendectomy.

Random Weird Body Facts
Here are a few final weird facts about the human body.

Your head creates inner noises: It’s rare, but exploding head syndrome exists.
Memory is affected by body position: Where you are and how you are placed in your environment triggers memory.

You can’t tickle yourself: Go ahead. Try to tickle yourself.
Being right-handed can prolong your life: If you’re right-handed, you could live up to nine years longer than a lefty.

Only humans shed emotional tears: Every other animal that produces tears has a physiological reason for doing so.

Interesting Human Body Facts

-The largest cell in the human body is the female egg and the smallest is the male sperm.

-A full bladder is roughly the size of a soft ball.

- Approximately 75% of human faeces is made of water.

- It takes the food seven seconds to get from your mouth to your stomach.

-One human hair can support 3kg.

- Human thighbones are stronger than concrete.

-The attachment of human muscles to skin is what causes dimples.

-Your thumb is the same length of your nose.

- A woman's heart beats faster than a man's.

- If the average male never shaved, his beard would be 13 feet long when he died.

- Men without hair on their chests are more likely to get cirrhosis of the liver than men with hair.

-There are about one trillion bacteria on each of your feet.

- Side by side, 2000 cells from the human body could cover about one square inch.

- Women blink twice as much as men.

-The average person's skin weighs twice as much as their brain.

- When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.

- It takes twice as long to lose new muscle if you stop working out than it did to gain it.

-You're ears secrete more earwax when you are afraid than when you aren't.

-Your body uses 300 muscles to balance itself when you are standing still.

- If saliva cannot dissolve something, you cannot taste it.

-The average woman is 5 inches shorter than the average man.

In one day, a human sheds 10 billion skin flakes. This amounts to approximately two kilograms in a year.

Every square inch of the human body has about 19,000,000 skin cells.

Approximately 25% of all scald burns to children are from hot tap water and is associated with more deaths than with any other liquid.

Forty-one percent of women apply body and hand moisturizer at least three times a day.

Every hour one billion cells in the body must be replaced.

The world record for the number of body piercing on one individual is 702, which is held by Canadian Brent Moffat.

The small intestine in the human body is about 2 inches around, and 22 feet long.

The human body makes anywhere from 1 to 3 pints of saliva every 24 hours.

The human body has approximately 37,000 miles of capillaries.

The aorta, which is largest artery located in the body, is about the diameter of a garden hose.

The adult human body requires about 88 pounds of oxygen daily.

It is very common for babies in New Zealand to sleep on sheepskins. This is to help them gain weight faster, and retain their body heat.

An average women has 17 square feet of skin. When a women is in her ninth month of pregnancy she has 18.5 square feet of skin.

The width of your armspan stretched out is the length of your whole body.

41% of women apply body or hand moisturizer a minimum three times a day.

A human's small intestine is 6 meters long.

There are as many hairs per square inch on your body as a chimpanzee. You don't see all of them because most are too fine and light to be noticed.

Every hour one billion cells in the body must be replaced.

Dead cells in the body ultimately go to the kidneys for excretion.

By walking an extra 20 minutes every day, an average person will burn off seven pounds of body fat in an year.

The human body is 75% water.

1.In the average adult, the skin covers 12-20 square feet and accounts for 12% of body weight.b

2.There are more than 600 individual skeletal muscles in the human body.c

3.An adult skeleton has 213 bones.a

4.Cartilage is one of the few tissues that grows throughout life. Between ages 30 and 70, a nose might grow half an inch, and the ears grow about a quarter of an inch.e

5.A newborn's skull contains gaps between its bony plates. In an adult, the jagged plates interlock tightly like a jigsaw puzzle.a

6.The average human head has about 100,000 hairs.c

7.As a person ages, the diameter of each hair on the head shrinks. Hair is thickest in the early 20s, but by age 70, it can be as fine as a baby's. Aging also causes hair to grow where it is not wanted, such as in the nose and ears, and to fall out where it is desired.e

8.Hundreds of billions of neurons carry electrical signals that control the body from the brain and the spinal cord.c

Alien hand syndrome occurs when a brain injury victim loses control over a hand, as if it is possessed by an alien being

9.After sustaining trauma to the brain—such as an injury, stroke, or infection—some people develop “alien hand syndrome,” a condition where the victim can feel sensation in the hand, but has no control over movement and does not sense the hand as a part of the body, as if it belonged to an alien being.d

10.The Greek philosopher Aristotle believed that the brain exists mainly to help cool the spirit. It is now known that the brain controls nearly every function of the body and mind.c

11.When the pituitary gland malfunctions, it can boost or reduce the amount of growth hormone in a growing child's body, resulting in gigantism or dwarfism.a

12.The senses are highly attuned to our world, but they have limits. For example, humans cannot see in the ultraviolet spectrum as bees do, nor can they differentiate between the hundreds of millions of odors that a bloodhound can.c

13.The appendix has no function in modern humans. It is believed to have been part of the digestive system in our primitive ancestors.b

14.Humans smell “in stereo.” Scent signals from each nostril travel to different regions in the brain. This may help a person determine the direction the odor is coming from.c

15.The skin contains approximately 640,000 sense receptors, scattered unevenly over the body's surface. These receptors are most abundant in the ridges of the fingertips, in the lips, at the tip of the tongue, in the palms, on the soles of the feet, and in the genitals.e

16.An estimated five million olfactory receptors are clustered in the membrane at the upper part of our nasal passages. These receptors help us distinguish among thousands of different odors.e

17.There are about 9,000 taste buds on the surface of the tongue, in the throat, and on the roof of the mouth.b Taste buds contain chemoreceptors that respond to chemicals from food and other substances that are dissolved by the saliva in the mouth.e

18.Humans produce about 10,000 gallons of saliva in a lifetime. Saliva is required for taste—until food is dissolved by saliva, we cannot taste it.b

19.Hearing is one of the less acute senses in humans, compared to the many other animals which can detect sound at much higher and lower frequency than humans can.c

The lens of the eye thickens as a person ages, causing many middle-aged people to need glasses

20.As humans grow older, the lens in the eye grows thicker. This is why people who once had perfect vision often need glasses in their 40s.c

21.An adult human body contains approximately 100 trillion cells.e

22.The body carries about 25 trillion red blood cells (erythrocytes), the most abundant cells in the body. Red blood cells make up about 45% of blood's volume.e

23.Every hour, about 180 million newly formed red blood cells enter the bloodstream. Red blood cells are basically shells. Before being released from the bone marrow, most of a red blood cell's internal structure is ejected, creating a disc-shaped balloon that is ideal for carrying oxygen and a small amount of the body's carbon dioxide.c

24.White blood cells, or leukocytes, make up about 1% of blood. This number can double within a day when a body responds to infection.c

25.The circulatory system of arteries, veins, and capillaries is about 60,000 miles long.e

26.The heart beats more than 2.5 billion times in an average lifetime.b

27.Unlike other muscles, the heart muscle contracts without stimulus from the nervous system. Signals for the heart to beat come from the sinoatrial node near the top of the right atrium.c

28.In a healthy adult, the small intestine can range between 18 and 23 feet long, about four times longer than the person is tall.b About 90% of the body's nutrients are absorbed into the bloodstream in the small intestine.c

29.At about five feet in length, the large intestine is shorter than the small intestine. However, it is more spacious so it can store and process material that will be eliminated.c

30.There are approximately 400 feet of seminiferous tubules in the testes of a human male.c This is where sperm is stored until an ejaculation releases 200 million to 500 million sperm, each of which is capable of fertilizing an egg.e

31.During ovulation, the number of white blood cells in the cervical mucus drops dramatically. If it did not, the white blood cells would destroy all foreign bodies, including sperm.e

32.Unlike other cells, which contain an individual's full DNA, the egg and sperm each contain only half of the DNA required to create a new human. Both halves must be combined for humans to reproduce.g

A good diet helps a child's brain develop properly

33.Proper diet is critical for brain development in children. The brains of children who have died of malnutrition during the first year of life have fewer brain cells and an overall smaller size than the brains of healthy children.f

34.DNA, the basic building block of life, is a long molecule containing four chemical bases: adenine (A), guanine (G), thymine (T), and cytosine (C).g

35.The human genome—half the DNA contents of a single nucleus—contains about 31 billion base pairs: 31,000,000,000 A's, G's, T's, and C's.g

36.Six billion steps of DNA are contained in a single cell. This DNA can be stretched six feet, but it is coiled up in the cell's nucleus, which measures only 1/2500 of an inch in diameter.e

37.The maximum length of a mammal's life is generally related to its size. Thus, a man's lifespan should be somewhere between that of a goat and a horse, between 10 and 30 years. However, humans have developed ways to protect themselves from predators and disease, increasing their average lifespan to 74.7 years in the United States.

- A full bladder is roughly the size of a soft ball.

- It takes the food seven seconds to get from your mouth to your stomach.

- One human hair can support 3 kg.

- Human thighbones are stronger than concrete.

- The attachment of human muscles to skin is what causes dimples.

-Your thumb is the same length of your nose.

- A woman's heart beats faster than a man's.

- If the average male never shaved, his beard would be 13 feet long when he died.

- Men without hair on their chests are more likely to get cirrhosis of the liver than men with hair.

- There are about one trillion bacteria on each of your feet.

- Side by side, 2000 cells from the human body could cover about one square inch.

- Women blink twice as much as men.

- The average person's skin weighs twice as much as their brain.

- When you are looking at someone you love, your pupils dilate,

They do the same when you are looking at someone you hate.

- It takes twice as long to lose new muscle if you stop working out than it did to gain it.

- You're ears secrete more earwax when you are afraid than when you aren't.

- Your body uses 300 muscles to balance itself when you are standing still.

- If saliva cannot dissolve something, you cannot taste it.

- The average woman is 5 inches shorter than the average man.

•A human being loses an average of 40 to 100 strands of hair a day.

•A cough releases an explosive charge of air that moves at speeds up to 60 mph.

•Every time you lick a stamp, you're consuming 1/10 of a calorie.

•A fetus acquires fingerprints at the age of three months.

•A sneeze can exceed the speed of 100 mph.

•Every person has a unique tongue print.

•According to German researchers, the risk of heart attack is higher on Monday than any other day of the week.

•After spending hours working at a computer display, look at a blank piece of white paper. It will probably appear pink.

•An average human drinks about 16,000 gallons of water in a lifetime.

•A fingernail or toenail takes about 6 months to grow from base to tip.

•An average human scalp has 100,000 hairs.

•It takes 17 muscles to smile and 43 to frown.

•Babies are born with 300 bones, but by adulthood we have only 206 in our bodies.

•Beards are the fastest growing hairs on the human body. If the average man never trimmed his beard, it would grow to nearly 30 feet long in his lifetime.

•By age sixty, most people have lost half of their taste buds. By the time you turn 70, your heart will have beat some two-and-a-half billion times (figuring on an average of 70 beats per minute.)

•Each square inch of human skin consists of twenty feet of blood vessels.

•Every human spent about half an hour as a single cell.

•Every person has a unique tongue print. Every square inch of the human body has an average of 32 million bacteria on it.

•Fingernails grow faster than toenails.

•Humans shed about 600,000 particles of skin every hour - about 1.5 pounds a year. By 70 years of age, an average person will have lost 105 pounds of skin.
Babies are born with 300 bones, but by adulthood we have only 206 in our bodies.
What happens is babies are born with incomplete bones - many consist of several chunks of bone connected by cartilage. Later on, the cartilage is replaced by real bone, resulting in two or more bone pieces 'fusing' into one adult bone.

Bones Facts

The smallest bone in the human body is the stapes bone which is located in the ear.

There are 54 bones in your hands including the wrists.

The only bone fully grown at birth is located in the ear.

The human face is made up of 14 bones.

The chances of getting a cavity is higher if candy is eaten slowly throughout the day compared to eating it all at once and then brushing your teeth.

If an identical twin grows up without having a certain tooth, the other twin will most likely also grow up with that tooth missing.

Humans are born with 300 bones in their body, however when a person reaches adulthood they only have 206 bones. This occurs because many of them join together to make a single bone.

Gardening is said to be one of the best exercises for maintaining healthy bones.

Enamel is hardest substance in the human body.

Although the outsides of a bone are hard, they are generally light and soft inside. They are about 75% water.

Adult human bones account for 14% of the body's total weight.

In 2000 babies are born with a tooth that is already visible.

Fingernails grow nearly 4 times faster than toenails!

Your thigh bone is stronger than concrete.

The strongest bone in your body is the femur (thighbone), and it's hollow!

•Babies are born with more than 300 bones in their body. As we grow into adults, some of the bones grow together - an adult skeleton has 206 bones.



•Bones are alive! They are growing, living tissue. Bones are constantly renewed throughout our lives through a process called resorption. A process called formation then adds to the bones.


•When children are little, their skeletons re-new themselves every 2 years!


•Bones are actually hollow - the inside of a bone is filled with bone marrow, which is then protected by the hard, outer surface of the bone.


•Oxygen is carried around our bodies by red blood cells, which are made by the bone marrow.


•The smallest bone is in the ear. It is called the stirrup bone and is the size of half a grain of rice


•The biggest bone is in the leg. It is called the femur or thighbone.


•The strongest bone in the skeleton is the jawbone.


•Over half the bones in the skeleton are found in the hands and feet. The hand alone has 27 bones - in each one.


•A broken bone will take about 12 weeks to heal.


•Your skeleton increases about seven times in mass through your childhood, so this is the vital time for it to get plenty of bone building calcium.

Human Eyes Facts

We should never put anything in or near our eyes, unless we have a reason to use eye drops. We would only do that if our doctor or parent told us to use them.

Blinking helps to wash tears over our eyeballs. That keeps them clean and moist. Also, if something is about to hit our eye, we will blink automatically.

Our body has some natural protection for our eyes. Our eyelashes help to keep dirt out of our eyes. Our eyebrows are made to keep sweat from running into our eyes.

Our eyes are very important to us, and we must protect them. We don't want dirt, sand, splinters or even fingers to get in our eyes. We don't want our eyes to get scratched or poked. That could damage our sight!

The study of the iris of the eye is called iridology.

The shark cornea has been used in eye surgery, since its cornea is similar to a human cornea.

The number one cause of blindness in adults in the United States is diabetes.

The eyeball of a human weighs approximately 28 grams.

The eye of a human can distinguish 500 shades of the gray.

The cornea is the only living tissue in the human body that does not contain any blood vessels.

The conjunctiva is a membrane that covers the human eye.

Sailors once thought that wearing a gold earring would improve their eyesight.

Research has indicated that a tie that is on too tight cam increase the risk of glaucoma in men.

People generally read 25% slower from a computer screen compared to paper.

Men are able to read fine print better than women can.

In the United States, approximately 25,000 eye injuries occur that result in the person becoming totally blind.

All babies are colour blind when they are born.

A human eyeball weighs an ounce.

If the lens in our eye doesn't work quite right, we can get glasses to help us see. Glasses have lenses in them that work with our eye's own lens to help us see better.

Babies' eyes do not produce tears until the baby is approximately six to eight weeks old.

The reason why your nose gets runny when you are crying is because the tears from the eyes drain into the nose.

The most common injury caused by cosmetics is to the eye by a mascara wand.

Some people start to sneeze if they are exposed to sunlight or have a light shined into their eye.

The highest recorded speed of a sneeze is 165 km per hour.

It is impossible to sneeze with your eyes open.

The space between your eyebrows is called the Glabella.

Inside our eye, at the back, is a part called the "retina." On the retina are cells called "rods" and "cones." These rods and cones help us to see colors and light.

Just behind the pupil is a lens. It is round and flat. It is thicker toward the middle.

Over the front of our eye is a clear covering called the "conjunctiva."

The white part of our eye is called the "sclera." At the front, the sclera becomes clear and is called the "cornea."

Around the pupil is a colored muscle called the "iris." Our eyes may be BLUE, BROWN, GREEN, GRAY OR BLACK, because that is the color of the iris.

Our eyes have many parts. The black part on the front of our eye is called the "pupil." It is really a little hole that opens into the back part of our eyes.

Your eyes blinks over 10,000,000 times a year!