Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
According to studies, men change their minds two to three times more often than women.
72
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
One barrel of petroleum holds 42 gallons.
20