In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
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