Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Nylon is made from coal and petroleum.
42
A ball of glass will bounce higher than a ball made of rubber.
73
Scientists in Germany have developed a candy that doesn't cause cavities.
11
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65