Iron weighs more after it rusts.
16
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Nearly 50% of the world's scientists are assigned to military projects.
71
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Your brain is 80% water.
525
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
Pumice is the only rock that floats on water.
14