Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
A cesium atom in an atomic clock beats over nine billion times a second.
43
The smell of freshly cut grass is actually a plant distress call.
31
The average temperature at 40,000 feet above sea level is -60 F.
56
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55