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 come from dead skin.
48
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Aluminum used to be more valuable than gold!
84
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
Each day, up to 150 species of life become extinct.
-23
The bark of an older redwood tree is fireproof.
65
Diamonds can be shattered with a hammer.
-104