For every gallon of sea water, you get more than a quarter pound of salt.
45
A ball of glass will bounce higher than a ball made of rubber.
73
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The smell of freshly cut grass is actually a plant distress call.
31
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
Iron weighs more after it rusts.
68