Sound travels fifteen times faster through steel than through air.
134
In zero gravity, a candle's flame is round and blue.
16
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
One third of the electricity produced on earth is used to power electric light bulbs!
75
The bark of an older redwood tree is fireproof.
65
Each day, up to 150 species of life become extinct.
-23
Pumice is the only rock that floats on water.
14
Research indicates that plants grow healthier when they are stroked.
173