April 2025 News
April 2025 Gwern.net newsletter with links on TODO
April 2025’s Gwern.net newsletter is now out; previous, March 2025 (archives). This is a collation of links and summary of major changes, overlapping with my Changelog; brought to you by my donors on Patreon.
Writings
Links
AI
History of the Micromouse robotics competition (Micromouse maze-running wasn’t actually about naive algorithmic maze-solving, but end-to-end minimization of time—completely different! Also showcases evolutionary shifts in record-setters)
“Cyc: Obituary for the greatest monument to logical AGI”, Yuxi Liu 2025
“Compression Represents Intelligence Linearly”, Huang et al 2024
“Interpreting Emergent Planning in Model-Free Reinforcement Learning”, Bush et al 2025 (model-free RL agents can learn to do model-based-RL-like planning)
“The world’s first commercial automatic chicken sexing machine” (chick sexing falls to the machines)
“NeuRaLaTeX: A machine learning library written in pure LaTeX”; ytmytm/llama2.c64: Inference Llama-2 on a C64 (runs TinyStories 0.2m-param LLM: “You will receive one output token every ~8 minutes. This is an estimation, the attention step depends on the number of tokens generated so far, so the process gets slower & slower.”)
Genetics
Everything Is Heritable:
Recent Evolution:
Engineering:
Statistics/Meta-Science
“Flat origami is Turing Complete”, Hull & Zakharevich 2023
Politics/Religion
Psychology/Biology
“Primates as prey: Ecological, morphological and behavioral relationships between primate species and their predators”, Hart 200026ya (our primate ancestors were hunted a lot, especially by cats)
“Dose-response relationship between evening exercise and sleep”, Leota et al 2025
“How some tropical trees benefit from being struck by lightning: evidence for Dipteryx oleifera and other large-statured trees”, Gora et al 2025
Sultan Khan; “Arithmetical Prodigies”, Scripture 1891
Technology
“The Secret History of the War in Ukraine” (good, fast command & control, with fast OODA loops, are critical to making modern weapons extremely effective in war)
Economics
“The M6 forecasting competition: Bridging the gap between forecasting and investment decisions”, Makridakis et al 2024
“The Effects of Medical Debt Relief: Evidence from Two Randomized Experiments”, Kluender et al 2024
“Zyn and the New Nicotine Gold Rush: White snus pouches were designed to help Swedish women quit cigarettes. They’ve become a staple for American dudes” (where did all this Zyn suddenly come from nowhere out of? Sweden, turns out)
“The Haves and the Have-Yachts: Luxury ships attract outrage and political scrutiny. The ultra-rich are buying them in record numbers” (Why super-yachts? Because they are still exclusive, and due to legal regulations, offer “a level of service you cannot really contemplate until you’ve been fortunate enough to experience it.”)
“Who Reaps All the Superchats? A Large-Scale Analysis of Income Inequality in Virtual YouTuber Livestreaming”, Zhao et al 2025
Philosophy
Fiction
“William Stanley, 6th Earl of Derby” (real Shakespeareans know that the Earl of Oxford claim is nothing but a conspiracy theory meant to distract from the true earl who wrote the Bard’s plays)
Books
Fiction:
Garfield: His 9 Lives
Film/TV
Animated: