I Never Knew That: The Human Condition


If your body’s natural defences failed, the bacteria in your gut would consume you within 48 hours, eating you from the inside out.

Only 4 per cent of babies are born on their due date.

People who smoke have 10 times as many wrinkles as people who don’t smoke.

People who suffer from gum disease are twice as likely to have a stroke or heart attack.

We use 43 muscles to frown.

We use 17 muscles to smile.

The fastest-moving muscle in the human body is the one that opens and closes the eyelid.

14 million people were killed in World War One; 20 million died in the flu epidemic that followed it.

Right-handed people tend to scratch with their left hand, and vice-versa.

It takes the typical person 7 minutes to fall asleep.

Every year, there are more births in India than there are people in Australia.

Someone who eats little is said to eat like a bird, even though many birds eat twice their weight in a day.

The hydrochloric acid in the human stomach is strong enough to dissolve a nail.

The foot is the most common part of the body bitten by insects.

There are over 100 million light-sensitive cells in the retina.

The opposite of ‘cross-eyed’ is ‘wall-eyed’.

We use 54 muscles every time we step forward. 88The surface area of a human lung is equivalent W to a tennis court.

Men have on average 10 per cent more red blood cells than women do.

One square inch of human skin contains 625 sweat glands. The Islands of Langerhans are a group of cells located in the pancreas.

Most people have lost 50 per cent of their taste buds by the time they reach 60.

15 million blood cells are produced and destroyed in the human body every second.

The human head is a quarter of our total length at birth, but an eighth of our total length by the time we reach adulthood.

Between the ages of 20 and 70, the typical person spends about 600 hours having sex.

Our hearing is less sharp after eating too much. The hardest bone in the human body is the jawbone.

The largest cell in the human body is the ovum; the smallest is the sperm.

The most sensitive cluster of nerves is at the base of the spine.

By lying on your back and raising your legs slowly you can’t sink in quicksand.

The longest-recorded tapeworm found in the human body was 33 metres in length.

Vegetarians live longer and have more stamina than meatteaters, but they have a higher chance of getting blood disorders.

An eyelash lives about 5 months.

There are approximately 100 million acts of sexual intercourse each day.

In an average lifetime a person will walk the equivalent of three times around the world.

© Mitchell Symons, This Book

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