Ready for a fresh set of puzzles? Click here for the September/October 2026 Puzzle Corner, brought to you by Michael S. Branicky, ScD ’95, of the Puzzle Corner Puzzle Crew (aka PC2), which also includes Edward Faulkner ’03, MEng ’04, and Abe Kunin ’03. This column includes solutions to the May/June issue.
Send problems, solutions (by October 1), and comments to puzzlecorner@technologyreview.com. Editor emeritus Allan Gottlieb ’67 launched Puzzle Corner in 1966. Find back issues through 2022 at cs.nyu.edu/~gottlieb/tr and more recent back issues at technologyreview.com/puzzle-corner.
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Reddit is expanding its moderation tools and building stronger abuse prevention systems that it says could eventually reduce communities’ reliance on karma and account-age requirements, making it easier for legitimate newcomers to participate.
Both the battery-powered and wired models are over $50 off. | Image: Ring Ring’s Wired Doorbell Pro and Battery Doorbell Plus are two of the brand’s most well-rounded video doorbells, whether you’re looking for a hardwired model or one that runs on a battery. Right now, its Wired Doorbell Pro is down to $199 ($50 off) at Amazon and Best Buy, while the Battery Doorbell Plus is on sale for $119.99 ($60 off) at Amazon and Best Buy. Both deals are the second-best prices we’ve seen, just $20 shy of their Prime Day lows. Ring Wired Doorbell Pro Where to Buy: $249.99 $199.99 at Amazon $249.99 $199.99 at Best Buy $249.99 $199.99 at Ring Ring Battery Doorbell Plus (second-gen) Where to Buy: $179.99 $119.99 at Amazon (includes Indoor Cam Plus) $179.99 $119.99 at Best Buy $179.99 $119.99 at Ring Aside from how they’re powered, the main difference between the two comes down to video quality. The Wired Doorbell Pro records sharper 4K video, and it can automatically respond to visitors with prerecorded messages. The Battery Doorbell Plus has fewer features and can capture video in slightly less sharp 2K resolution. Beyond that, the two doorbells share many of the same core features. Both can provide a head-to-toe view of your doorstep and support motion detection, two-way talk, and support for color night vision. If you’re willing to pay $4.99 for a monthly subscription, you also get more specific alerts for people, packages, and vehicles. Upgrading to the $19.99 Ring Pro plan, meanwhile, grants access to extra AI features like facial recognition and text-based activity summaries, all of which are free for the first month. Both also work well with Amazon Alexa, allowing you to view a live feed on a compatible Echo Show smart display and receive audible announcements when someone…
Homeland Security told immigrants that leaving the US would wipe out fines it claims they owe. Now it wants private investigators to find them in their home countries and collect.
