Balsa wood is classified as a hard wood!
41
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
Most dust particles in your house come from dead skin.
48