Hot water can freeze faster than cold water.

Wacky WorldScience

Known as the Mpemba effect after a Tanzanian student who noticed it in 1963. Scientists still debate when and why it happens.

Another wacky fact → All facts

Explore more Science facts

Sound travels about four times faster in water than in air.Neptune was discovered with mathematics before anyone saw it.A day on Mars is only about 40 minutes longer than a day on Earth.