Pumice is the only rock that floats on water.
14
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
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
5
In zero gravity, a candle's flame is round and blue.
16
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The force of a suction cup is calculated using F=AP.
15