https://greglum.com/learnLearn AI ยท Greg LumUnderstand AI through everyday questions, examples, and sources. Start with Making Sense of AI, or follow a path for using, building with, or reviewing AI.2026-10-29T00:00:00ZGreg Lumhttps://greglum.com/https://greglum.com/learn/finding-before-answeringFinding Before Answering2026-10-28T00:00:00Z2026-10-29T00:00:00ZFollow a holiday returns question from search to reply, see why a better choice cannot recover a missing policy, and check each stage.https://greglum.com/learn/bounded-decisionsShould a Model Make This Decision?2026-10-25T00:00:00Z2026-10-29T00:00:00ZCompare code, classifiers, and models for a fixed choice, set an error limit, and test on fresh cases.https://greglum.com/learn/cheapest-model-that-passesChoosing the Cheapest Model That Passes2026-10-29T00:00:00Z2026-10-29T00:00:00ZWrite the bar first, test the smallest model on frozen cases, and move up one size only when a check fails.https://greglum.com/learn/designing-ai-systemsDesigning the System Around a Model2026-10-26T00:00:00Z2026-10-29T00:00:00ZChoose the simplest AI design that does the job, then decide its context, limits, recovery, and evidence, with Ask the Archive as the example.https://greglum.com/learn/reading-model-claimsHow to Read a Model Claim2026-10-28T00:00:00Z2026-10-29T00:00:00ZAsk 7 questions about a model comparison: its baseline, version, sample size, total cost, and who ran it.https://greglum.com/learn/ai-and-workWill AI take my job, or change it?2026-10-28T00:00:00Z2026-10-29T00:00:00ZFind out what studies measure about AI and work, then test which tasks an assistant could help you finish and check.https://greglum.com/learn/how-ai-answers-workHow does an AI answer get made?2026-10-27T00:00:00Z2026-10-28T00:00:00ZFollow an event notice into an AI answer, and check what context, generation, and search each contribute.https://greglum.com/learn/getting-help-from-aiGetting Useful Help from AI2026-10-27T00:00:00Z2026-10-28T00:00:00ZTurn a vague request into a task an assistant can work on, then check and improve its reply.https://greglum.com/learn/ai-privacy-and-actionsWhat should I share, and what can it do?2026-10-27T00:00:00Z2026-10-28T00:00:00ZCheck saved chats, training choices, and connected tools, and see why drafting and sending need different permissions.https://greglum.com/learn/understanding-ai-newsMaking Sense of What You Hear About AI2026-10-27T00:00:00Z2026-10-28T00:00:00ZTurn an AI headline into a task you can assess, and separate results from predictions.https://greglum.com/learn/what-agents-doWhat does an AI agent actually do?2026-10-28T00:00:00Z2026-10-28T00:00:00ZFollow a book-swap task through tools, choices, and approvals, then decide when a fixed workflow would do.https://greglum.com/learn/writing-versus-choosingWriting an Answer or Choosing One2026-10-28T00:00:00Z2026-10-28T00:00:00ZFollow a bike shop request through writing, finding, ranking, choosing, and the jobs for ordinary software.https://greglum.com/learn/ai-costs-and-tokensWhat makes an AI request cost more?2026-10-28T00:00:00Z2026-10-28T00:00:00ZWork out the token bill for a book-swap question box, then compare caching, batching, and sending less.https://greglum.com/learn/where-models-runWhere should an AI model run?2026-10-28T00:00:00Z2026-10-28T00:00:00ZCompare who sees your text, what you pay, and who maintains the model when you use a hosted service, a cloud platform, or your own machine.https://greglum.com/learn/ai-rules-and-datesWhich AI rules apply, and when?2026-10-28T00:00:00Z2026-10-28T00:00:00ZRead an AI rule by place, role, use, and date, with examples from the EU, the US, and South Korea.https://greglum.com/learn/tricking-ai-systemsHow can someone trick an AI assistant?2026-10-28T00:00:00Z2026-10-28T00:00:00ZFollow hidden instructions in a book-swap email and see which permissions can limit the harm.https://greglum.com/learn/ai-across-industriesHow is AI used in different fields?2026-10-28T00:00:00Z2026-10-28T00:00:00ZFollow documented AI uses across 9 fields: what goes in, who checks the result, and what a mistake costs.https://greglum.com/learn/ai-energy-and-computeHow much energy does AI use?2026-10-28T00:00:00Z2026-10-28T00:00:00ZCheck what electricity and water estimates count, from a single AI question to training a model and running data centers.https://greglum.com/learn/cited-answersHow can I check an AI answer?2026-10-23T00:00:00Z2026-10-27T00:00:00ZCheck the facts, open the sources, and notice what is missing. A confident answer or a citation can still be wrong.https://greglum.com/learn/what-is-aiWhat do people mean by AI?2026-10-27T00:00:00Z2026-10-27T00:00:00ZSee how predicting, recognizing, recommending, and creating content fit under the name AI.https://greglum.com/learn/why-ai-nowWhy is everyone talking about AI now?2026-10-27T00:00:00Z2026-10-27T00:00:00ZFollow the changes that brought AI from learning patterns to tools you can talk to.https://greglum.com/learn/ai-names-explainedChatGPT, Claude, and All Those Names2026-10-27T00:00:00Z2026-10-27T00:00:00ZUntangle the company, model, assistant, and tool behind familiar AI names, with no technical background needed.https://greglum.com/learn/one-rulebook-two-agentsOne Rulebook for Two Agents2026-10-23T00:00:00Z2026-10-23T00:00:00ZGive Claude Code and Codex the same user-level rules through an import and a symbolic link.https://greglum.com/learn/public-repo-to-better-skillFrom a Public Repo to a Better Skill2026-10-23T00:00:00Z2026-10-23T00:00:00ZFind advice your skill needs, check its source and license, and test the change against a known failure.https://greglum.com/learn/catching-what-agents-missCatching What Agents Miss2026-10-23T00:00:00Z2026-10-23T00:00:00ZSee how fresh review, browser measurements, and accessibility tests caught 4 defects in a Draftroom change that passed local checks.tag:greglum.com,2026-10-23:learn-log/2Prepared my skills repository for public release2026-10-23T00:00:00Z2026-10-23T00:00:00ZA cleaned export of the catalog, with an installer dry run, a validator, and license notices.tag:greglum.com,2026-10-23:learn-log/1Studied public motion skills for the film skill2026-10-23T00:00:00Z2026-10-23T00:00:00ZAdopted timing defaults, script checks, and a critique loop into motion-film, with each source and license recorded.tag:greglum.com,2026-10-22:learn-log/2Cleaned up my development environment2026-10-22T00:00:00Z2026-10-22T00:00:00ZRetired Zed, Neovim, Warp, Podman, Caveman, an offline semantic search tool, and a local docs index. Context7 replaced the docs index.tag:greglum.com,2026-10-22:learn-log/1Wrote down how I split work between agents2026-10-22T00:00:00Z2026-10-22T00:00:00ZClaude Code mainly implements. Codex mainly refines writing, researches, and configures the machine. It is a habit, not a rule.tag:greglum.com,2026-10-20:learn-log/1Four problems caught before one release2026-10-20T00:00:00Z2026-10-20T00:00:00ZAn agent-built Draftroom change passed the local gate. Reviewers, a phone screenshot, and CI still caught four problems before merge.tag:greglum.com,2026-10-18:learn-log/1Added How I Build to this site2026-10-18T00:00:00Z2026-10-18T00:00:00ZMy Claude Code and Codex setup, shared rules, skills, and checks, on one page.tag:greglum.com,2026-10-16:learn-log/1Gave the site a written point of view2026-10-16T00:00:00Z2026-10-16T00:00:00ZAfter Katie Dill's talk on "zombie UI", the design spec gained a point of view and principles that agents follow.