The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Pure water (H2O) does not conduct electricity on its own.
46
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
A cesium atom in an atomic clock beats over nine billion times a second.
43
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118