Here are the best free online courses to learn OCaml, a general-purpose, statically-typed programming language that is widely used in academia and research institutions.

TL;DR Duolingo reported Q4 2025 revenue of $282.9 million (+35% YoY), closing its first billion-dollar year, breaking estimates again. The stock dropped 22.5% anyway. Again. The company plans to slow down monetization to grow to 100 million DAUs until 2028, by focusing on teaching quality, giving more to free users, and growing non-language courses. Duolingo’s Q4 2025 results confirmed something we highlighted in its 2025 review: growth is slowing. The company crossed a billion dollars in r

As revealed in a recent earnings call, Coursera’s strategy is to integrate into existing university curricula, prioritizing ‘Coursera for Campus’ over its own online degree programs.

“Andrew is literally the only person that both Sam Altman and Dario Amodei have worked for. He is going to come up with things that nobody else can come up with.” “We don’t know exactly what those inventions and innovations will look like yet, but I’m highly confident that he is uniquely positioned to come up with things that we wouldn’t have come up with on our own.” That’s Greg Hart, Coursera’s CEO, on the July 29 earnings call, the first one since the Udemy merger, explaining why Coursera p