Carl Zimmer has a few excellent micro-focused posts that you shouldn't miss. Yesterday the topic was new research demonstrating kin selection in amoebae, and earlier in the week, he wrote about Wolbachia, a fascinating bacteria that infects a large number of insects. (Those of you who've read Margulis' "Acquiring Genomes" may remember that infection with this bacterium can decrease fertility between individual insects who are differential in the presence of Wolbachia, potentially leading to reproductive isolation. Josh has more on this).
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Thanks for the links, Tara. I think you're missing an /a tag--half the post is a link...
Sorry! Swear I previwed this before I scheduled it...guess not closely enough. :)