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Reinforcement learning, explained with a minimum of math and jargon

It’s Agent Week at Understanding AI! This week I’m going to publish a series of articles explaining the most important AI trend of 2025: agents! Today is a deep dive into reinforcement learning, the training technique that made agentic models like Claude 3.5 Sonnet and o3 possible. Today’s article is available for free, but some articles in the series—including tomorrow’s article on MCP and tool use—will be for paying subscribers only. I’m offering a 20 percent discount on annual subscriptions

Android phones could soon warn you of “Stingrays” snooping on your communications

Smartphones contain a treasure trove of personal data, which makes them a worthwhile target for hackers. However, law enforcement is not above snooping on cell phones, and their tactics are usually much harder to detect. Cell site simulators, often called Stingrays, can trick your phone into revealing private communications, but a change in Android 16 could allow phones to detect this spying. Law enforcement organizations have massively expanded the use of Stingray devices because almost every

How to Write Compelling Release Announcements

How to Write Compelling Software Release Announcements A release announcement showcases how the user’s experience is better today than it was yesterday. That sounds obvious, but most release announcements seem to forget that there’s a user at all. So many release announcements just enumerate new features in a way that’s totallly divorced from how real people use the software. The announcement is essentially just a changelog with better writing. For example, here’s a “changelog” style of annou

The Bank Secrecy Act is failing everyone. It’s time to rethink financial surveillance.

The US is on the brink of enacting rules for digital assets, with growing bipartisan momentum to modernize our financial system. But amid all the talk about innovation and global competitiveness, one issue has been glaringly absent: financial privacy. As we build the digital infrastructure of the 21st century, we need to talk about not just what’s possible but what’s acceptable. That means confronting the expanding surveillance powers quietly embedded in our financial system, which today can tra

Police seizes Archetyp Market drug marketplace, arrests admin

Law enforcement authorities from six countries took down the Archetyp Market, an infamous darknet drug marketplace that has been operating since May 2020. Archetyp Market sellers provided the market's customers with access to high volumes of drugs, including cocaine, amphetamines, heroin, cannabis, MDMA, and synthetic opioids like fentanyl through more than 3,200 registered vendors and over 17,000 listings. Over its five years of activity, the marketplace amassed over 612,000 users with a tota

'No Kings’ Protests, Citizen-Run ICE Trackers Trigger Intelligence Warnings

As protests continue to swell across the United States in response to aggressive Immigration and Customs Enforcement actions, civilians are turning to homebrew digital tools to track ICE arrests and raids in real time. But restricted government documents, obtained by the nonprofit watchdog Property of the People, show that US intelligence agencies are now eyeing the same tools as potential threats. A law enforcement investigation involving the maps is also apparently underway. Details about Sat

Engadget Podcast: Breaking down the highlights of WWDC 2025

We're joined by friends from Wired and The Washington Post. In this special episode, recorded live in Cupertino, Cherlynn and Deputy Editor Nathan Ingraham are joined by the Washington Post's Chris Velazco and Wired's Julian Chokkattu to discuss Apple's announcements at WWDC 2025. Though the announcements were all over the place and felt difficult to judge until they roll out to devices, our guests and hosts agree that they felt more meaningful than past WWDCs. Credits Hosts: Cherlynn Low and

Best Places to Buy Replacement Prescription Lenses Online in 2025

Some companies may expedite your order more quickly if you send them detailed info about your frames. It's important to know exactly what your prescription is (ideally a current one), although some companies can pull it from your old lenses if necessary. Check the site for discount codes or first-time buyer discounts (you usually have to provide your email address). The prescription for your glasses is typically only valid for a year or two. If it’s time to replace your current lenses, you ca