Indoor pollution is 10 times more toxic than outdoor pollution.
62
Cold water weighs more than hot water.
93
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Balsa wood is classified as a hard wood!
41
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
A single speck of dust is half way in size between a subatomic particle and the Earth.
15