The bark of an older redwood tree is fireproof.
65
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Sound travels about 4 times faster in water than in air.
408