Sound travels about 4 times faster in water than in air.
408
The bark of an older redwood tree is fireproof.
65
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Each day, up to 150 species of life become extinct.
-23
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Most dust particles in your house come from dead skin.
48
Cold water weighs more than hot water.
93