Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A cubic yard of air weighs about 2 pounds at sea level.
31
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Nylon is made from coal and petroleum.
42
The average temperature at 40,000 feet above sea level is -60 F.
56
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39