Matt Strassler's post prodded me to look back and notice something: we really have had quite an amazing collection of guest bloggers over the years. There is a page on the site dedicated to keeping track (as well as a category), but nobody every clicks there, so I thought I would just reproduce the list here. We have a few more in the pipeline, keep your eyes peeled!
Lawrence Krauss on string-theory skepticism
Paul Kwiat on quantum computation
Anthony Aguirre on the Foundational Questions Institute
Chanda Prescod-Weinstein on the community of scientists
Joe Polchinski (the string debates; science or sociology)
Heather Ray on MiniBoone
Michelangelo D'Agostino on particle physics fieldwork in antarctica
Juan Collar on dark matter detection
Tom Levenson (Isaac Newton as the first cosmologist; Iraq War suicides and the material basis of consciousnessEinstein, religion, and Jewishness)
Joel Corbo on graduate school and teaching
David E. Kaplan, the LHC ...
