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It's "science Friday" in the world of public radio, which is a good time to pass along one of the more fascinating videos of the week. It answers the question "why is the sky dark at night?"
That would be a great question to ask at a presidential debate, by the way.
And another question. Will "we" ever go out there to those other worlds? Over to you, Carl.
and that's all lovely, but looking back at this planet is still pretty cool, too...
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