the quantum level) about whether the “quantum state” of a particle simply represents knowledge used to make predictions, or is in fact a real thing in itself. This epistemic vs. ontic argument warrants the advertised Part 2 of this post,
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, coming soon.
But don’t hope for a definitive resolution of that issue,
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. That’s not the quantum way.
After Bell’s 1989 talk,
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, I chatted with him briefly, telling him I had enjoyed his book of collected papers on quantum topics. He remarked that I therefore knew more about it all than he did, as he had forgotten most of what he had written.
In the quarter century since then,
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, I’ve read hundreds more papers on quantum physics,
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, at least a couple of dozen books,
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, attended numerous quantum talks at conferences and interviewed many of the world’s leading quantum experts multiple times. So I can confidently say now that John Bell was wrong. I don’t know more than he did about quantum physics,
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, because the more I find out about it the less I know. In fact, I’m pretty sure that I know nothing at all. And I’m beginning to suspect that nobody else knows anything,
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, either. It may just be inherent in the very nature of the universe that we just can’t know. All anybody can do is suspect.
Follow me on Twitter: @tom_siegfried
Earthlings may owe a debt of gratitude to the enormous miniplanets that smashed into the planet in its youth. Such collisions might have knocked away much of the supply of chlorine concentrated on the planet’s surface, geochemists propose. Had that loss not occurred, the world’s oceans would have been too salty for complex life to thrive, they suggest.
The scenario may explain why Mars, which suffered fewer large impacts, may have more than twice as much chlorine as Earth does, the researchers report April 16 in Earth and Planetary Science Letters.
“The story seems to hang together pretty well,” says James Brenan, a geologist at the University of Toronto who wasn’t involved in the study. “Life, probably over a fairly long time, might have been able to adapt to this environment, though certainly things would be different than today.”
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