Cold water weighs more than hot water.
93
One ragweed plant can release as many as one billion grains of pollen!
51
Sound travels about 4 times faster in water than in air.
408
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
German chemists made a replica of a trophy the size of one molecule.
68
A cubic yard of air weighs about 2 pounds at sea level.
31
Hot water can freeze faster than cold water.
181
The bark of an older redwood tree is fireproof.
65