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| 21. |
There are more living organisms on the skin of a single human being than there are human beings on the surface of the earth. |
| 22. |
From the age of thirty, humans gradually begin to shrink in size. |
| 23. |
Your body contains enough iron to make a spike strong enough to hold your weight. |
| 24. |
The surface area of a human lung is equal to that of a tennis court. |
| 25. |
Most people have lost fifty per cent of their taste buds by the time they reach the age of sixty. |
| 26. |
The amount of carbon in the human body is enough to fill about 9,000 'lead' pencils. |
| 27. |
One square inch of human skin contains 625 sweat glands. |
| 28. |
When you blush, your stomach lining also reddens. |
| 29. |
The human body has less muscles in it than a caterpillar. |
| 30. |
If you could save all the times your eyes blink in one life time and use them all at once you would see blackness for 1.2 years! |
| 31. |
The life span of a taste bud is ten days. |
| 32. |
It's impossible to sneeze with your eyes open. |
| 33. |
Give a tennis ball a good, hard squee ze. You're using about the same amount of force your heart uses to pump blood out to the body. |
| 34. |
The aorta, the largest artery in the body, is almost the diameter of a garden hose. |
| 35. |
Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair. |
| 36. |
Your body has about 5.6 liters (6 quarts) of blood. This 5.6 liters of blood circulates through the body three times every minute. |
| 37. |
The heart pumps about 1 million barrels of blood during an average lifetime--that's enough to fill more than 3 super tankers. |
| 38. |
Babies start dreaming even before they're born. |
| 39. |
The human body can function without a brain. |
| 40. |
Humans are the only primates that don't have pigment in the palms of their hands. |