Most dust particles in your house come from dead skin.
48
Iron weighs more after it rusts.
16
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
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
Sound travels about 4 times faster in water than in air.
408