Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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In zero gravity, a candle's flame is round and blue.
16
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
The bark of an older redwood tree is fireproof.
65
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Iron weighs more after it rusts.
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One ragweed plant can release as many as one billion grains of pollen!
51