A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The bark of an older redwood tree is fireproof.
65
Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
1
A cubic yard of air weighs about 2 pounds at sea level.
31
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65