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> Over time, these add up into real change, even if you don't see it happening in the course of a single thread.

Without evidence, this is a difficult claim to accept.

I have certainly changed my own positions as a result of civil discussions. it never happens after a single exchange, but over time people can be convinced.

Live long enough and you get it. It's just how people work. Seeing it happen is the evidence.

You don't need a study to prove gravity or magnetism.

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