Pumice is the only rock that floats on water.
14
Iron weighs more after it rusts.
68
Termites are being researched as a possible renewable energy source as they can produce up to 2 litres of hydrogen from ingesting a single sheet of paper, making them one of the planet’s most efficient bioreactors.
24
One barrel of petroleum holds 42 gallons.
20
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
Balsa wood is classified as a hard wood!
41
A cubic yard of air weighs about 2 pounds at sea level.
31