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
A ball of glass will bounce higher than a ball made of rubber.
73
Sound travels about 4 times faster in water than in air.
408
The bark of an older redwood tree is fireproof.
65
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
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