There are two Sean Carroll : number one is a professor of molecular biology, genetics, and medical genetics, and the author of Endless forms most beautiful (taste) ; while number two is an assistant professor at the Fermi institute, mostly interested in the very different issues of cosmology, field theory, and gravitation (he is also a co-host at the new cosmic variance blog).
Talk about coincidences. It all makes sense now.
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Bloody Fingers 