How a bot-fighting test turned into edtech’s most iconic brand, Duolingo – TechCrunch
Luis von Ahn, an entrepreneur who has dedicated his career to scaling free education, has probably annoyed you more than once. With Yahoo as a distribution channel, CAPTCHA tests exploded in popularity, becoming an almost universally recognizable security checkpoint feature. About 10% of the world’s population had recognized at least one word, von Ahn estimates. This time, von Ahn knew his nifty idea was worth something. What von Ahn didn’t know, though, was that his iconic work was simply foreshadowing.