Iron weighs more after it rusts.
16
A cesium atom in an atomic clock beats over nine billion times a second.
43
Scientists aren't sure what color dinosaurs were.
312
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
According to studies, men change their minds two to three times more often than women.
72