All the more reason to let them in, promote their case and supporting 'evidence'; and then gently show them the error of their ways - by kindly but firmly tearing every little foundation they cling to into small unsupportable fragments... and then countering each point with as much 'hard' evidence as required... either that person will keep the blinkers on, and eventually go away frustrated, or that person will accept that pseudo-science just doesn't stand up, and we will have one more promoting reality over fantasy - either way, we can't lose!

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