It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Sound travels about 4 times faster in water than in air.
408
Iron weighs more after it rusts.
68
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Hot water can freeze faster than cold water.
181
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
Balsa wood is classified as a hard wood!
41