Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The bark of an older redwood tree is fireproof.
65
Scientists in Germany have developed a candy that doesn't cause cavities.
11
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
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17