Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
Sound at the right vibration can bore holes through a solid object.
134
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Hot water can freeze faster than cold water.
181
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Nylon is made from coal and petroleum.
42