Most dust particles in your house come from dead skin.
48
If the chemical sodium is dropped into water it will immediately and violently explode.
67
One 75-watt bulb gives more light than three 25-watt bulbs.
57
A cubic yard of air weighs about 2 pounds at sea level.
31
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
One barrel of petroleum holds 42 gallons.
20
For every gallon of sea water, you get more than a quarter pound of salt.
45