This story appears in the August 2019 issue of National Geographic magazine. All of us are descended from migrants. Our species, Homo sapiens, did not evolve in Lahore, where I am writing these words.

Nat Geo’s 21 most compelling images of the 21st century Nat Geo’s 21 most compelling images of the 21st century These are our best animal photos of 2020 These are our best animal photos of ...