Assorted links by Tyler Cowen October 18, 2011 at 1:40 pm 1. A new theory of sandwich envy. 2. Douthat on Pinker. 3. Fast-evolving gene is key player in brain development. 4. More on the Amish renegades. 5. Quantum levitation (video). 6. Paul Krugman defends the economics blogosphere.