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David O'Halloran's avatar

Excellent, as ever, and thanks for another great post. I had no idea about this one. Quite technical today so will print off, sit down and study it. It seems to me that what you are really saying here is that if one fish is swimming around another in a whirl pool then it is impossible to say which is moving and which is still and which one is going around the other. Is the universe wobbling? Are we? My head is spinning; but one thing I am sure of is that we do not know for sure one way or the other.

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