Eric Rescorla @rtfm.com · 25/06/2026Today on the newsletter: a look at the Amazon v. Perplexity case educatedguesswork.org/posts/notes-...educatedguesswork.orgNotes on Amazon v. PerplexityAgentic browsing and the Open Web 000
Eric Rescorla @rtfm.com · 09/06/2026Now up on the newsletter: Why your asthma inhaler is so expensive (in the US). Hint: it starts with the ozone hole... educatedguesswork.org/posts/asthma...educatedguesswork.orgWhy your asthma inhaler is so expensive (in the US)It starts with the ozone hole... 000
Eric Rescorla @rtfm.com · 23/05/2026Now up on the newsletter: Understanding Age Assurance Accuracy educatedguesswork.org/posts/age-as...educatedguesswork.orgUnderstanding age assurance accuracy 022
Eric Rescorla @rtfm.com · 11/05/2026PSA. One benefit of having an electric car is it can make parking easier. It's not uncommon to come across a parking lot which is entirely full but has open EV charging spots. More expensive than charging at home but pretty cheap on the "cost of parking" scale. 000
Eric Rescorla @rtfm.com · 28/03/2026This week on the newsletter: "How not to mandate device-based age assurance" educatedguesswork.org/posts/device... In this post, we examine a number of enacted or proposed requirements for device-based age assurance and some of the ways they can go wrong.educatedguesswork.orgHow not to mandate device-based age assuranceSoftware design by legal mandate 154
Eric Rescorla @rtfm.com · 07/03/2026Some real map/territory confusion in this report by the LA Marathon to give people medals if they drop out after 18 miles (because it's hot). The finisher's medal commemorates that you finished, but it doesn't make you a finisher. www.nytimes.com/2026/03/07/u... 100
Eric Rescorla @rtfm.com · 06/03/2026Now up on the newsletter: Let's build a tool-using agent In this post, I walk through in some detail how AI agent tool calling works, including digging into the inputs and outputs of the LLM before they get translated into a coherent-looking JS API. educatedguesswork.org/posts/tool-c... 100
Reposted by Eric RescorlaKnight-Georgetown Institute (KGI) @knightgtown.bsky.social · 29/01/2026📣 New from KGI: Age Assurance Online explores how age assurance systems work and their tradeoffs in accuracy, circumvention, availability, and privacy. A must-read for policymakers, service providers + users to understand the consequences of these systems: kgi.georgetown.edu/research-and...kgi.georgetown.eduAge Assurance Online: A Technical Assessment of Current Systems and their Limitations – Knight-Georgetown Institute 043
Eric Rescorla @rtfm.com · 25/12/2023 Now up, part II in my series about transparency systems: Certificate Transparency in Reality educatedguesswork.org/posts/transp... 000
Reposted by Eric RescorlaRichard Barnes @ipv.sx · 15/12/2023Welcome to Bluesky @rtfm.com ! Folks might recognize EKR from such hits as TLS 1.3, Let's Encrypt, and being Firefox CTO. He also writes a really good blog. Y'all should all follow him. 022
Eric Rescorla @rtfm.com · 15/12/2023Hello Blue Sky! Check out first post in my series on transparency systems. educatedguesswork.org/posts/transp... 141
