Here are the best online courses and resources to learn Lisp and its most popular dialects: Common Lisp, Scheme, Racket, and Emacs Lisp.

Confession: I used to think critical thinking meant being skeptical of everything. Question every headline, every claim, every source. Look beyond the face value. But critical thinking is structured evaluation, and knowing when to accept a good argument is as much a part of it as knowing when to reject a bad one. The people I know who are actually good at this are calmer, not louder. That’s what makes picking a course tricky. Two courses called “critical thinking” can teach almost nothing in c

Class Central, yet again, came across a 2U employee’s layoff post on LinkedIn. This is its sixth layoff (that we know of) since 2U acquired edX in 2021. The first one happened in 2022 for profitability’s sake. Since then, the company filed for bankruptcy (mostly due to the debt it took to acquire edX for $800M), took down its bootcamps, exited many university partnerships, and even got delisted from the stock market. The previous layoffs were framed as strategy shifts, realigning operations, o

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In Q4 2025, Duolingo announced it would let go of $50M in bookings to reach 100 million daily active users (DAUs) by 2028; a strategy Class Central covered in detail last month.  2026 is its “investment year,” and Q1 was the first quarter of execution. So far, the plan seems to be working. The Expected Results: Low Bookings, High DAUs Duolingo is running multiple tests to improve the free experience: spoken tokens for speaking practice, Speaking Adventures for real-world conversations, and fla