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Physicists Debate the Many Varieties of Nothingness

Helix Nebula

What is nothing? Sounds like a simple question—nothing is simply the absence of something, of course—until you begin to think about it. The other night the American Museum of Natural History hosted its 14th annual Asimov Memorial Debate, which featured five leading thinkers opining (and sparring, sometimes testily, but more on that later) about the [...]

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