Luis von Ahn is the brains, the driver and innovator behind Duolingo. From Guatemala, he’s a mathematician and computer scientist on a mission to keep language learning free. The story is fascinating. It was valued at $1.5 billion at the end of 2019 and their revenues have risen through the pandemic from $400,000 per day…
via 7 great things Duolingo teaches us about good online learning — Donald Clark Plan B
Nonpartisan Education Group 