Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Nearly 50% of the world's scientists are assigned to military projects.
71
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
The smell of freshly cut grass is actually a plant distress call.
31
A cubic yard of air weighs about 2 pounds at sea level.
31
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7