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<p>You evidently haven’t heard about the kind of letters that have been written to PZ’s boss. I don’t think PZ writes letters to people’s program directors to cause anyone to lose a job or to stop speaking in public, and maybe not for any purpose at all. If he did write a letter to a director of a graduate program in biology, it might be to ask how the program makes sure that it is teaching biology effectively and accurately, which is definitely an issue PZ cares about.</p>