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.
