Dry ice (solid carbon dioxide) was commercialized in 1925 and became important for refrigerated transportation, reducing shipping costs by 50%. Northeastern New Mexico's Bueyeros field became a major source of pure CO2 for dry ice production. Today, much of the extracted CO2 is used for enhanced oil recovery, creating complex climate implications.
A Science paper and several other publications have incorrectly cited the compound Cr2Gr2Te6, which does not exist. The correct compound is Cr2Ge2Te6 (chromium germanium telluride), with Ge representing germanium. This typographical error has been copied across multiple scientific papers and a book chapter.
The author shares monthly notes from January, focusing on algebraic graph theory concepts including Cayley graphs, vertex-transitive graphs, and Tutte's theorem. The notes also cover a JavaScript linear congruential generator implementation and line numbering with cat and nl commands.
The author shares monthly notes on algebraic graph theory, focusing on concepts from Norman Biggs's book. Key topics include vertex orbits, regular non-vertex-transitive graphs, and distinctions between vertex-transitive, edge-transitive, and symmetric graphs. The author aims to eventually understand Tutte's theorem on arc-transitive cubic graphs.
The author shares March 2026 notes covering algebraic graph theory studies from textbooks by Godsil & Royle and Norman Biggs, along with group theory concepts like permutations and homomorphisms. They also mention developing an open-source tool called Wander Console that recommends independent websites, which gained community interest on Hacker News.