For every gallon of sea water, you get more than a quarter pound of salt.
45
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
In zero gravity, a candle's flame is round and blue.
16
One ragweed plant can release as many as one billion grains of pollen!
51
A cesium atom in an atomic clock beats over nine billion times a second.
43
Scientists in Germany have developed a candy that doesn't cause cavities.
11