Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One ragweed plant can release as many as one billion grains of pollen!
51
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Scientists aren't sure what color dinosaurs were.
312
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The earth is approx. 6,588,000,000,000,000,000 tons.
175