Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Diamonds can be shattered with a hammer.
-104
4.5 pounds of sunlight strike the Earth each day.
27
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
A cesium atom in an atomic clock beats over nine billion times a second.
43
Each day, up to 150 species of life become extinct.
-23