The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Scientists aren't sure what color dinosaurs were.
312
A cubic yard of air weighs about 2 pounds at sea level.
31
Research indicates that plants grow healthier when they are stroked.
173
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
A cesium atom in an atomic clock beats over nine billion times a second.
43
Brass doorknobs automatically disinfect themselves in about 8 hours.
18