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Surviving Extreme Heat: Strategies for Living in Hot Environments
Personal Development
FREE
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Renewable Energy and Sustainable Development
Personal Development
FREE
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Latest Posts
[2025] 2000+ Free SWAYAM + NPTEL Courses
Swayam is India’s national online course platform, designed to support the country’s National Education Policy, which entails improving access to quality education in India.
At Class Central, we’ve been paying attention to Swayam since the very beginning. It launched in beta in 2016, and has now reached over 56 million enrollments with over 5.2 million certificates issued. It’s been growing rather fast.
Swayam offers courses in a wide variety of disciplines, including from prestigious institut
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15 Best Lisp Courses for 2025
Here are the best online courses and resources to learn Lisp and its most popular dialects: Common Lisp, Scheme, Racket, and Emacs Lisp.
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Duolingo’s Reddit Community Revolts: ‘No Más’ to Unpaid Support
Frustrated with handling unpaid customer support for a platform with 8.6 million paying subscribers, Duolingo’s Reddit community takes dramatic action against the $16.2 billion language learning company
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Duolingo’s Q4 2025: Record Revenue, Record Stock Drop, One Massive Buyback
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
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