If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Most dust particles in your house are made from dead skin!
67
The earth is approx. 6,588,000,000,000,000,000 tons.
175
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Nylon is made from coal and petroleum.
42
Your brain is 80% water.
525
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61