A cesium atom in an atomic clock beats over nine billion times a second.
43
Nearly 50% of the world's scientists are assigned to military projects.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Pure water (H2O) does not conduct electricity on its own.
46
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71