Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
One barrel of petroleum holds 42 gallons.
20
The sun is 330,330 times larger than the earth.
75
Pure water (H2O) does not conduct electricity on its own.
46
Most dust particles in your house come from dead skin.
48
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
One ragweed plant can release as many as one billion grains of pollen!
51