A cubic yard of air weighs about 2 pounds at sea level.
31
A ball of glass will bounce higher than a ball made of rubber.
73
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71