Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Sound at the right vibration can bore holes through a solid object.
134
Pumice is the only rock that floats on water.
14
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Pure water (H2O) does not conduct electricity on its own.
46
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0