You’ve cursed him without knowing him: Luis von Ahn has invented those annoying tests to prove you’re a human: «Select all images of traffic lights». That was a while ago — he went on to create the most successful app to learn new languages. To him, these two inventions are based on the same idea. This is one of many fascinating things you’ll learn in this excellent profile.

From Weekly Filet #459, in October 2023.