The bark of an older redwood tree is fireproof.
65
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The average home creates more pollution than does the average car.
33
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The earth is approx. 6,588,000,000,000,000,000 tons.
175