A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Diamonds can be shattered with a hammer.
-104
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
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