This is the first story in a four-part, weekly series on taxonomy and speciation. It's meant to help you as you participate in Armchair Taxonomist — a challenge from the Encyclopedia of Life to bring scientific descriptions of animals, plants, and other living things out from behind paywalls ...

Yesterday, during a cable news discussion of gun violence and the Newtown school shooting, I dared mention a taboo truism. During a conversation on MSNBC’s “Up With Chris Hayes,” I said that because most of the mass shootings in America come at the hands of white men, there ...