The smell of freshly cut grass is actually a plant distress call.
31
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Pumice is the only rock that floats on water.
14
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
One 75-watt bulb gives more light than three 25-watt bulbs.
57
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
The average temperature at 40,000 feet above sea level is -60 F.
56
Balsa wood is classified as a hard wood!
41