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Currently you are able to watch "Infinite Rainbows" streaming on Curiosity Stream or for free with ads on Tubi TV.
Infinite Rainbows is available to watch for free today. If you are in Australia, you can:
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They've captured our imagination and are a source of childlike wonder, but what exactly are rainbows? Learn the science behind these weather phenomenon and how one day they might help pinpoint habitable planets in deep space.