Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Cold water weighs more than hot water.
93
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The earth is approx. 6,588,000,000,000,000,000 tons.
175
A cesium atom in an atomic clock beats over nine billion times a second.
43
A single speck of dust is half way in size between a subatomic particle and the Earth.
15