Assorted links by Tyler Cowen May 19, 2012 at 1:15 pm 1. Edible stop signs in food. 2. Will smartphones alter psychology? 3. Ask Cowen Anything (on food), and Jerry Weinberger reviews An Economist Gets Lunch. 4. How do science fiction futures change over time? 5. Why is American mobility declining? 6. Saez and Diamond on taxes.