Oct 30 2019 30 mins 49

Luis von Ahn is co-founder and CEO of Duolingo, the world’s most popular language-learning tool, teaching more than 35 languages to 300 million people globally. Presented like a game, the platform plays to our competitive nature: a passive-aggressive owl called Duo reminds users to practise daily. The company is also expanding into literacy: new app ‘Duolingo ABC’ is aimed at helping people who can’t read or write to learn their mother tongues.