A ball of glass will bounce higher than a ball made of rubber.
73
Pumice is the only rock that floats on water.
14
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The sun is 330,330 times larger than the earth.
75
Aluminum used to be more valuable than gold!
84
One ragweed plant can release as many as one billion grains of pollen!
51