Pumice is the only rock that floats on water.
14
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
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
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
4.5 pounds of sunlight strike the Earth each day.
27
Iron weighs more after it rusts.
68
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39