When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
One cubic foot of gold weighs more than 1,200 pounds!
78
Scientists aren't sure what color dinosaurs were.
312
Iron weighs more after it rusts.
68
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
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