The smell of freshly cut grass is actually a plant distress call.
31
For every gallon of sea water, you get more than a quarter pound of salt.
45
Most dust particles in your house come from dead skin.
48
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
One third of the electricity produced on earth is used to power electric light bulbs!
75
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Brass doorknobs automatically disinfect themselves in about 8 hours.
18