Rationally Speaking #134 - Michael Shermer on: "Science drives moral progress"

Rationally Speaking #135 - Robin Hanson on: "Most human behavior is signaling"

Rationally Speaking #136 - David Roodman on Why Microfinance Won't Cure Global Poverty

Rationally Speaking #137 - Marc Lipsitch on, "Should scientists try to create dangerous viruses?"

Rationally Speaking #138 - Ian Morris on, "Why the West rules -- for now"

Rationally Speaking #139 - Eric Schwitzgebel on "Moral hypocrisy: why doesn't knowing about ethics make people more ethical?"

Rationally Speaking #140 - Kenny Easwaran on, "Newcomb's Paradox and the tragedy of rationality"

Rationally Speaking #141 - Dan Sperber on "The Argumentative Theory of reason"

Rationally Speaking #142 - Paul Bloom on "The case against empathy"

Rationally Speaking #143 - Scott Aaronson on "The theorem that proves rationalists can't disagree"