When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Pumice is the only rock that floats on water.
14
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Scientists aren't sure what color dinosaurs were.
312
Scientists in Germany have developed a candy that doesn't cause cavities.
11
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116