were among the first to recognize the dangers of lead contamination and then risked their careers and reputations to do something about it. At any time, any of us can act like a know-it-all arguing with a know-nothing. We have to battle this tendency in ourselves and others, but don’t assume that you can purge it in everyone. If you think you have to convince any single know-it-all that he doesn’t, you’re still feeling the downward tug of the infallibility battle. Just let it go.

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