Pumice is the only rock that floats on water.
14
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Sound travels about 4 times faster in water than in air.
408
Most dust particles in your house come from dead skin.
48
One cubic foot of gold weighs more than 1,200 pounds!
78
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17