The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The only letter not appearing on the Periodic Table is the letter "J".
180
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
One third of the electricity produced on earth is used to power electric light bulbs!
75
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Your brain is 80% water.
525
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