The earth is approx. 6,588,000,000,000,000,000 tons.
175
One ragweed plant can release as many as one billion grains of pollen!
51
Hot water can freeze faster than cold water.
181
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Each day, up to 150 species of life become extinct.
-23
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39