The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Research indicates that plants grow healthier when they are stroked.
173
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
Iron weighs more after it rusts.
68
In zero gravity, a candle's flame is round and blue.
16
Pumice is the only rock that floats on water.
14
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75