Cold water weighs more than hot water.
93
Sound travels fifteen times faster through steel than through air.
134
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
Iron weighs more after it rusts.
16
Airports that are at higher altitudes require a longer airstrip due to lower air density.
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
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
For every gallon of sea water, you get more than a quarter pound of salt.
45