Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Cold water weighs more than hot water.
93
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Aluminum used to be more valuable than gold!
84
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
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 force of a suction cup is calculated using F=AP.
15