All the countries in green are countries in which people are predominantly learning English., In most countries in the world, knowledge of English can significantly increase your income potential., Whereas with languages you can earn more money., The only way to really reach a lot of people was by a smartphone, in particular., ....And the trend is that that fraction is only going to increase., The vast majority of the revenue for Duolingo comes from people who pay to subscribe., One of the most powerful features of the app is the notion of a streak..

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