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* 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 full bladder is roughly the size of a soft ball.

* Approximately 75% of human feces 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.

* Men loose about 40 hairs a day. Women loose about 70 hairs a day.

* The length from your wrist to your elbow is the same as the length of your foot.

* Your heart beats 101,000 times a day. During your lifetime it will beat about 3 billion times and pump about 400 million litres (800 million pints) of blood.

* Your mouth produces 1 litre (1.8 pints) of saliva a day.

* On average, people can hold their breath for one minute. The world record is seven-and-a-half minutes.

* The human head contains 22 bones. More on the head and brains

* On average, you breathe 23,000 times a day.

* On average, you speak almost 5,000 words a day - although almost 80% of speaking is self-talk (talking to yourself).

* Einstein’s brain was of average size (1375 grams - 49oz).

* Over the last 150 years the average height of people in industrialised nations increased by 10 cm (4 in).

* In the 19th century, American men were the tallest in the world, averaging 1,71m (5′6″). Today, the average height for American men is 1,75m (5′7″), compared to 1,77m (5′8″) for Swedes, and 1,78m (5′8.5″) for the Dutch.

* If the amount of water in your body is reduced by just 1%, you’ll feel thirsty.

* A person can live without food for about a month, but only about a week without water.

* You’ll drink about 75,000 litres (20,000 gallons) of water in your lifetime.

* After a certain period of growth, hair becomes dormant. That means that it is attached to the hair follicle until replaced by new hair.

* Hair on the head grows for between two and six years before being replaced. In the case of baldness, the dormant hair was not replaced with new hair.

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* It’s your body’s largest organ, despite what the readers of Maxim think.

* An average adult’s skin spans 21 square feet, weighs nine pounds, and contains more than 11 miles of blood vessels.

* The skin releases as much as three gallons of sweat a day in hot weather. The areas that don’t sweat are the nail bed, the margins of the lips, and the eardrums.

* Body odor comes from a second kind of sweat—a fatty secretion produced by the apocrine sweat glands, found mostly around the armpits, genitals, and anus.

* The odor is caused by bacteria on the skin eating and digesting those fatty compounds.

* Breasts are a modified form of the apocrine sweat gland.

* Fetuses don’t develop fingerprints until three months’ gestation.

* Without a trace: Some people never develop fingerprints at all. Two rare genetic defects, known as Naegeli syndrome and dermatopathia pigmentosa reticularis, can leave carriers without any identifying ridges on their skin.

* Fingerprints increase friction and help grip objects. New World monkeys have similar prints on the undersides of their tails, the better to grasp as they swing from branch to branch.

* Globally, dead skin accounts for about a billion tons of dust in the atmosphere. Your skin sheds 50,000 cells every minute.

* There are at least five types of receptors in the skin that respond to pain and to touch.

* One experiment revealed that Meissner corpuscles—touch receptors that are concentrated in the fingertips and palms, lips and tongue, productive organs, and tip of breasts—respond to a pressure of just 20 milligrams, the weight of a fly.

* In blind people, the brain’s visual cortex is rewired to respond to stimuli received through touch and hearing, so they literally “see” the world by touch and sound.

* White skin appeared just 20,000 to 50,000 years ago, as dark-skinned humans migrated to colder climes and lost much of their melanin pigment.

* People have started radio frequency identification chips, or RFID tags, inserting under their skin. The tags can provide access to medical information, log on to computers, or unlock car doors.

* The Cleveland Public Library, Harvard Law School, and Brown University all have books clad in skin stripped from executed criminals.

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