If the chemical sodium is dropped into water it will immediately and violently explode.
67
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
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
One cubic foot of gold weighs more than 1,200 pounds!
78
Nearly 50% of the world's scientists are assigned to military projects.
71
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Most dust particles in your house come from dead skin.
48