A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Aluminum used to be more valuable than gold!
84
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Sound travels about 4 times faster in water than in air.
408
For every gallon of sea water, you get more than a quarter pound of salt.
45
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65