Your brain is 80% water.
525
Pure water (H2O) does not conduct electricity on its own.
46
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Most dust particles in your house are made from dead skin!
67
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The only letter not appearing on the Periodic Table is the letter "J".
180
