| It takes about 20 seconds for a red blood cell to circle the whole body |
| Red blood cells may live for about 4 months circulating throughout the body, feeding the 60 trillion other body cells |
| Red blood cells make approximately 250,000 round trips of the body before returning to the bone marrow, where they were born, to die |
| Within a tiny droplet of blood, there are some 5 million red blood cells |
| Your stomach has to produce a new layer of mucus every two weeks otherwise it will digest itself |
| The human brain is insensetive to pain, The suffering of a headache comes not from the brain but from the nerves and muscles lining it. |
| The human heart creates enough pressure while pumping to squirt blood 30 feet |
| Canadian researchers have found that Einstein's brain was 15% wider than normal. |
| One-fourth of the 206 bones in the human body are located in the feet |
| 80 % of people infected with a sexually transmitted disease have no symptoms. |