Wednesday assorted links by Tyler Cowen March 14, 2018 at 1:18 pm in 1. “…about 7 percent of the astronaut’s genetic code remained altered — and it may stay that way permanently.” 2. Does greater freedom to choose marriage partners increase observed sex differences? 3. The trains are slower because they slowed the trains down. 4. Will self-driving cars mean more alcoholism? 5. Is there a polarization of household consumption decisions? 6. California preemption and the freedom to build.