When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
A cubic yard of air weighs about 2 pounds at sea level.
31
Most dust particles in your house come from dead skin.
48
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Scientists aren't sure what color dinosaurs were.
312
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304