The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
In zero gravity, a candle's flame is round and blue.
16
Billions of neutrinos pass unnoticed through your body every second.
6
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
German chemists made a replica of a trophy the size of one molecule.
68
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Each day, up to 150 species of life become extinct.
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