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
One cubic foot of gold weighs more than 1,200 pounds!
78
The only letter not appearing on the Periodic Table is the letter "J".
180
A cubic yard of air weighs about 2 pounds at sea level.
31
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Diamonds can be shattered with a hammer.
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In zero gravity, a candle's flame is round and blue.
16