Iron weighs more after it rusts.
16
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Hot water can freeze faster than cold water.
181