Iron weighs more after it rusts.
68
In zero gravity, a candle's flame is round and blue.
16
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 Earth's atmosphere weighs about 5.5 quadrillion tons.
108
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
Out of all the senses, smell is most closely linked to memory.
146
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Sound travels about 4 times faster in water than in air.
408