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Medical term for belly button is umbilicus.

Those who smoke a pack of cigarettes a day drink half a cup of tar a year.

Humans are the only animals capable of drawing a straight line.

On average, an individual grows over 450 miles of hair in a lifetime.

When a person smiles, 17 muscles are engaged.

Human DNA contains 80,000 genes.

Men shorter than 4.2 feet and women shorter than 3.9 feet are considered dwarfs.

White blood cells live in the human body for 2 to 4 days, while red blood cells live up to 3 to 4 months.

Every human bends her finger 25 million times in a lifetime.

Human heart is equal in size to a human fist. Average weight of an adult’s heart is approximately 0.5lbs.

Human body contains four minerals: apatite, aragonite, calcite, and christobalite.

Human brain generates more electric impulses in a day than all telephones of the world combined.

The loss of vision caused by exposure to bright light is called snow blindness.

Total weight of bacteria living in the human body is 4.4lbs.

Human brain produces 100,000 chemical reactions per second.

Babies are born without kneecaps, which form only at the age of 2 to 6.

The area of human lungs’ surface is equal to that of a tennis court.

At birth, a baby’s brain contains 14 billion cells, and this number does not increase till death. On the contrary, after the age of 25 it decreases by 100,000 cells per day. Reading a page of text in a minute kills approximately 70 cells. After the age of 40, the brain degradation is accelerated, and after 50, neurons shrink and brain volume reduces.

The human small intestines are 8.5 feet long during life. After death, when the muscles of the bowel walls relax, it may reach over 19 feet.

An average human has approximately 2 million of perspiratory glands. An average adult person loses 540 calories with a liter of sweat. Men perspire 40% more than women.

The right lung holds more air than the left one.

An adult person makes approximately 23,000 breaths a day.

In a lifetime, the female body produces 7 million egg cells.

The human eye is capable of differentiating 10,000,000 hues.

There are approximately 40,000 bacteria in the human mouth.

It is impossible to sneeze with your eyes open.

The human spine contains 33 to 34 spinal bones.

Women blink twice as often as men.