The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
Nylon is made from coal and petroleum.
42
Liquid TIDE laundry detergent glows under a blacklight.
96
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
For every gallon of sea water, you get more than a quarter pound of salt.
45
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5