The sole of the foot leaves the foot, about 250,000,000,000 (two hundred fifty billion) of the odorant particles of sweat, which is why dogs can keep track of a person.

The food we eat about 10 meters walk takes one day to make that journey. During the course of his life (60 years average) a person consumes approximately thirty tons of food, which weigh about six elephants.

The hair is very resistant. A normal adult would be hoisted by a rope woven with only 1,000 hairs. On the scalp there are about 100,000 hairs, and all over the body several hundred thousand hairs.

The sensitivity of the human eye is so acute that, in a clear, moonless night, a person who is on top of a mountain can see a lit match to 80 miles away. Much to his amazement, the astronauts are in orbit around the Earth could see the wakes of ships.

The human body consists of about 60,000 billion cells, and each has a number of molecules 10,000 times greater than the number of stars in the Milky Way.

During a brisk walk or a discussion, the heart pumps blood faster than during sex.