As a negotiations coach, I saw this entire sequence of events as a huge teaching moment for CEOs and business leaders who must negotiate every day.

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But after leaving his teaching post, he started going to open-mic events in the Philadelphia suburbs.

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Disputes over the extent to which Christianity should be part of the school day have roused strong feelings in some states - with prolonged rows over the displaying of the Ten Commandments, the teaching of the Creation story and the public saying of prayers before sports events.

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