Friday assorted links by Tyler Cowen April 22, 2022 at 12:19 pm 1. Hologram doctor visits astronauts. 2. New evidence for the intercontinental trade of Greenlandic ivory in the Middle Ages. 3. Scientists invent device for optimally separating Oreos. 4. Brian Potter on why skyscrapers are so short. 5. Violence reemerging in rural Colombia? (NYT)