Probably the [best explanation of rainbows](https://www.youtube.com/watch?v=6Hl7BLXq5vA) I’ve ever seen. Not ELI5 though, more like college physics level.
[Found a 1 minute explanation as well](https://www.youtube.com/watch?v=uRmdZVvzMzQ), closer to ELI5 level.
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