Sunday assorted links by Tyler Cowen October 24, 2021 at 2:02 pm 1. Ducklings and fluid mechanics. 2. How many Americans were abandoned in Afghanistan and still wish to get out? 3. Why does Hollywood start going crazy with sequels around 1999? 4. Ilya Somin on the great Anthony Downs. 5. Patrick McKenzie free email newsletter about financial infrastructure. 6. The cost of running government bureaucracies on COBOL. 7. The Economist on Nigeria.