Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists aren't sure what color dinosaurs were.
312
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Iron weighs more after it rusts.
16
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13