Balsa wood is classified as a hard wood!
41
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Research indicates that plants grow healthier when they are stroked.
173
Iron weighs more after it rusts.
16
Your brain is 80% water.
525
Sound at the right vibration can bore holes through a solid object.
134