Every one of these was made on request

A minute of video for anything you wonder about.

None of these films existed before somebody asked for them. Yours will not either.

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Why is the sky blue?
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Where did Earth's iron come from?
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How do vaccines teach the immune system?
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What actually happens inside a black hole?
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Why does sleep make memory stick?
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How does CRISPR cut one gene?

Now ask your own

Whyzit answers in about three seconds.

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