Did you know that:

1.Your skull is made up of 29 different bones.

2.Your right lung can take in more air than your left.

3.You can lose 150 calories per hour if you hit your head against the wall.

4.Women’s hearts beat faster than men’s.

5.Women blink about two times less often than men.

6.When you blush, your stomach also turns red.

7.We lose 80% of our body heat from the head.

8.There are more than 100 different viruses which cause a cold.

9.There are about 40,000 bacteria in the human mouth.

10.The total weight of the bacteria in the human body is 2 kg.

11.The total strength of masticatory muscles on one side of your jaw is equal to 195 kilograms.

12.The total length of all the blood vessels in the human body is about 100,000 km.

13.The surface area of the human lungs is approximately equal to the area of a tennis court.

14.The structure of the human body contains only four minerals: apatite, aragonite, calcite, and crystobalite.

15.The strongest muscle in the human body is the tongue.

16.The smallest cells in a man’s body are sperm cells.

17.The scientific name for the belly button is the umbilicus.

18.The retinas inside the eye cover about 650 square mm and contain 137 million light-sensitive cells: 130 million are for black and white vision and 7 million are for helping you see in colour.

19.The rate at which a person’s hair grows doubles during an airplane flight.

20.The only part of the body that has no blood supply is the cornea of the eye. It receives oxygen directly from the air.

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