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
In zero gravity, a candle's flame is round and blue.
16
Liquid TIDE laundry detergent glows under a blacklight.
96
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42