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
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Nylon is made from coal and petroleum.
42
Aluminum used to be more valuable than gold!
84