Your skin is actually an organ.
88
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
If your stomach didn't produce a new layer of mucous every two weeks, it would digest itself.
33
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Ernest Hemingway survived through anthrax, malaria, pneumonia, dysentery, skin cancer, hepatitis, anemia, diabetes, high blood pressure, two plane crashes, a ruptured kidney, a ruptured spleen, a ruptured liver, a crushed vertebra, a fractured skull, and more.
67
Your thumb is about the same size as your nose.
124
Pain travels through the body at 350 feet per second!
23