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Just ran into this one while checking out the latest acquisitions for our public library system. "Why Humans Like to Cry" by Michael Trimble. It looks a bit dry and scientific, but there are a couple chapters that may be worth checking out. I've placed a hold so as soon as it comes into the system I'll be able to read it; I'll let you all know what I think.
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That sounds as if it has promise. I'll definitely check it out!