Interesting Discoveries (25 pics)

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The inside of the Leaning Tower of Pisa is empty.

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Red light only penetrates about 30 feet underwater, therefore blood appears green further down.

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The famous meme was a face swap all along.

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This is the speed of light in real-time.

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Images showing how forced perspective was used to film Will Ferrell in "Elf."

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There are constellations named after the Avengers!

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This is what the nerves related to the teeth look like.

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Towers of Dubai breaking through the clouds

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The inside of a fire alarm is really just a tiny switch.

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This is what a tiger's skin looks like when it's shaved

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Dirt sticks to sweat. Deep scars don’t regenerate with sweat glans and thus dirt doesn’t stick to it.