Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Diamonds can be shattered with a hammer.
-104
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
The smell of freshly cut grass is actually a plant distress call.
31
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17