Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Sound travels about 4 times faster in water than in air.
408
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
The earth is approx. 6,588,000,000,000,000,000 tons.
175
One 75-watt bulb gives more light than three 25-watt bulbs.
57