The smell of freshly cut grass is actually a plant distress call.
31
Indoor pollution is 10 times more toxic than outdoor pollution.
62
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
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Sound travels fifteen times faster through steel than through air.
134
Balsa wood is classified as a hard wood!
41
