Friday assorted links by Tyler Cowen December 4, 2015 at 11:46 am 1. Can epigenetics influence sperm? 2. The Marc Andreessen productivity guide. 3. Russ Roberts chats with Mitch Weiss on the economics of the Broadway musical. 4. What it’s like to visit Cuba now, as an American. 5. Which kinds of books actually sell? 6. Music of Adele without overproduction, it is a shame what we are losing.