Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Scientists aren't sure what color dinosaurs were.
312
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17