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 75-watt bulb gives more light than three 25-watt bulbs.
57
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Pumice is the only rock that floats on water.
14
A cubic yard of air weighs about 2 pounds at sea level.
31
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116