Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The force of a suction cup is calculated using F=AP.
15
Hot water can freeze faster than cold water.
181
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65