A Lunchtime Conversation – Causality

  Yesterday, over lunch, I was trying to explain in simple terms the idea of causality to a colleague of mine, and found that it is very difficult to wrap your head around, especially for the uninitiated. He had seen a documentary on The Big Bang (not the comedy show), and was trying to grapple with ideas around the age of the universe, parallel universes, and how, if there are infinite possible parallel universes, everything that is...

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