Indoor pollution is 10 times more toxic than outdoor pollution.
62
Sound travels fifteen times faster through steel than through air.
134
Iron weighs more after it rusts.
68
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Hot water can freeze faster than cold water.
181
Iron weighs more after it rusts.
16
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108