The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Iron weighs more after it rusts.
16
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
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 most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
One barrel of petroleum holds 42 gallons.
20
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9