Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
In zero gravity, a candle's flame is round and blue.
16
Balsa wood is classified as a hard wood!
41
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
The bark of an older redwood tree is fireproof.
65
Sound travels about 4 times faster in water than in air.
408
If the chemical sodium is dropped into water it will immediately and violently explode.
67