The bark of an older redwood tree is fireproof.
65
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The only letter not appearing on the Periodic Table is the letter "J".
180
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One ragweed plant can release as many as one billion grains of pollen!
51
Most dust particles in your house are made from dead skin!
67
The average home creates more pollution than does the average car.
33
A cubic yard of air weighs about 2 pounds at sea level.
31