Out of all the senses, smell is most closely linked to memory.
146
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
For every gallon of sea water, you get more than a quarter pound of salt.
45
Iron weighs more after it rusts.
16
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
Your brain is 80% water.
525
Most dust particles in your house are made from dead skin!
67
The average temperature at 40,000 feet above sea level is -60 F.
56