Sound travels about 4 times faster in water than in air.
408
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Iron weighs more after it rusts.
16
The force of a suction cup is calculated using F=AP.
15
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
Most dust particles in your house are made from dead skin!
67