The smell of freshly cut grass is actually a plant distress call.
31
Sound travels about 4 times faster in water than in air.
408
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A cubic yard of air weighs about 2 pounds at sea level.
31
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
One barrel of petroleum holds 42 gallons.
20
Scientists are now able to grow 'beating' heart tissue in a lab!
162
The bark of an older redwood tree is fireproof.
65