Out of all the senses, smell is most closely linked to memory.
146
The average temperature at 40,000 feet above sea level is -60 F.
56
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Sound at the right vibration can bore holes through a solid object.
134
Hot water can freeze faster than cold water.
181
Indoor pollution is 10 times more toxic than outdoor pollution.
62