A cubic yard of air weighs about 2 pounds at sea level.
31
Aluminum used to be more valuable than gold!
84
A ball of glass will bounce higher than a ball made of rubber.
73
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Sound travels about 4 times faster in water than in air.
408
The bark of an older redwood tree is fireproof.
65
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
German scientists claim to have evidence that suggests that our universe may exist inside of a computer simulated Matrix.
18