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If you go to London now, not everything is beautiful, but it's amazingly better than it was. And the Thames is certainly a lot better: There are fish in the Thames.

"Legendary physicist Freeman Dyson talks about math, nuclear rockets, and astounding things about the universe". Interview with Elena Holodny, uk.businessinsider.com. September 9, 2016.
If you go to London now, not everything is beautiful, but it's amazingly better than it was. And the Thames is certainly a lot better: There are fish in the Thames.