On November 21, 2023, field intelligence officers within the Department of Homeland Security quietly deleted a trove of Chicago Police Department records. It was not a routine purge.

For seven months, the data—records that had been requested on roughly 900 Chicagoland residents—sat on a federal server in violation of a deletion order issued by an intelligence oversight body. A later inquiry found that nearly 800 files had been kept, which a subsequent report said breached rules designed to prevent domestic intelligence operations from targeting legal US residents. The records originated in a private exchange between DHS analysts and Chicago police, a test of how local intelligence might feed federal government watchlists. The idea was to see whether street-level data could surface undocumented gang members in airport queues and at border crossings. The experiment collapsed amid what government reports describe as a chain of mismanagement and oversight failures.

Internal memos reviewed by WIRED reveal that the dataset was first requested by a field officer in the DHS’s Office of Intelligence & Analysis (I&A) in the summer of 2021. By then, Chicago’s gang data was already notorious for being riddled with contradictions and error. City inspectors had warned that police couldn’t vouch for its accuracy. Entries created by police included people purportedly born before 1901 and others who appeared to be infants. Some were labeled by police as gang members but not linked to any particular group.

Police baked their own contempt into the data, listing people’s occupations as “SCUM BAG,” “TURD,” or simply “BLACK.” Neither arrest nor conviction was necessary to make the list.

Prosecutors and police relied on the designations of alleged gang members in their filings and investigations. They shadowed defendants through bail hearings and into sentencing. For immigrants, it carried extra weight. Chicago’s sanctuary rules barred most data sharing with immigration officers, but a carve-out at the time for “known gang members” left open a back door. Over the course of a decade, immigration officers tapped into the database more than 32,000 times, records show.

The I&A memos—first obtained by the Brennan Center for Justice at NYU through a public records request—show that what began inside DHS as a limited data-sharing experiment seems to have soon unraveled into a cascade of procedural lapses. The request for the Chicagoland data moved through layers of review with no clear owner, its legal safeguards overlooked or ignored. By the time the data landed on I&A’s server around April 2022, the field officer who had initiated the transfer had left their post. The experiment ultimately collapsed under its own paperwork. Signatures went missing, audits were never filed, and the deletion deadline slipped by unnoticed. The guardrails meant to keep intelligence work pointed outward—toward foreign threats, not Americans—simply failed.

Faced with the lapse, I&A ultimately killed the project in November 2023, wiping the dataset and memorializing the breach in a formal report.

Spencer Reynolds, a senior counsel at the Brennan Center, says the episode illustrates how federal intelligence officers can sidestep local sanctuary laws. “This intelligence office is a workaround to so-called sanctuary protections that limit cities like Chicago from direct cooperation with ICE,” he says. “Federal intelligence officers can access the data, package it up, and then hand it off to immigration enforcement, evading important policies to protect residents.”

Engineers at the University of California, Davis, have invented a device that can generate mechanical power at night by linking the natural warmth around us to the cold depths of space. The invention could be used, for example, to ventilate greenhouses or other buildings. The work is described Nov. 12 in Science Advances.

The invention is a type of machine called a Stirling engine. Other machines such as internal combustion engines generate power from a large heat gradient, said Jeremy Munday, professor of electrical and computer engineering at UC Davis and co-author on the paper. In contrast, a Stirling engine can work based on a small difference in temperature, such as that between a hot cup of coffee and its surroundings.

“These engines are very efficient when only small temperature differences exist, whereas other types of engines work better with larger temperature differences and can produce more power,” Munday said.

Typically, a Stirling engine is directly connected to a heat source on one side and a cooler environment on the other side.

“If you just set it on the table, it’s not going to produce any power on its own because all sides are the same temperature,” Munday said.

One way to generate a temperature difference, of course, is to heat up one side by burning fuel. Munday and graduate student researcher Tristan Deppe wondered if instead they could connect the cold side to something very, very cold but also very far away: deep space.

“It doesn’t actually have to touch space physically, it can just interact radiatively with space,” Munday said. It’s like standing outside on a cold, clear night: Your head will quickly start to feel cold as heat radiates away.

Deppe and Munday’s idea was to take a simple Stirling engine (essentially a piston driving a flywheel), put it on a panel that acts as a heat-radiating antenna and sit the whole thing on the ground outdoors at night. The ground acts as the warm side of the engine and the antenna channels the cold of space.

A year of night time experiments shows that the small device can indeed generate at least 400 milliwatts of mechanical power per square meter. The researchers used the device experimentally to directly power a fan and also coupled it to a small electrical motor to generate current.

The experiments show that it is possible to generate useful amounts of power from the night sky. The potential is greatest in areas where humidity is low and night skies are usually clear, Munday said. The principle could be used, for example, to ventilate greenhouses or residential buildings.

UC Davis has filed a provisional patent related to the work.

Huckberry, purveyors of finely curated clothing and gear for the sort of person equally at home in the woods and the city, is having one of the company’s rare site-wide sales this week—or pretty close to site-wide. We’ve tested and love quite a bit of Huckberry’s stuff, especially the Proof 72-hour merino T-shirt. If you buy nothing else this year, buy that. Trust me. Check out the other deals, which we’ve rounded up below.

Great Deals on our Favorite Travel Clothes

Huckberry’s Proof 72-hour merino T-shirt is our favorite merino wool T-shirt. The cut and style are not overly sporty, making it more versatile than some others, from everyday wear around town to a trip to the gym. Mine is still soft even after six months of wear and washing. At 87 percent 150 gsm superfine merino wool (16.5 micron) and 13 percent nylon, this T-shirt makes a great starter for those new to merino wool—there’s enough nylon that’s stretchy, and not the least bit itchy.

These pants are the companion piece to the 72-hour shirt above. There’s quite a bit less wool here though. The breakdown is 47 percent merino wool, 33 percent nylon, 14 percent polyester, and 6 percent elastane. The result is a much stretchier fabric than the t-shirt, which still provides a good amount of moisture-wicking and the anti-odor properties of merino. My only gripe with these is that they feel synthetic. What I love about them is the stain resistance. Yes, that DWR coating that gives them that stain resistance will wear off, but it’s not too hard to rejuvenate it.

When I travel, these are the pants I wear. They’re light, comfy, stretchy, and weigh next to nothing. They’re 98 percent cotton, with 2 percent Spandex to give them a little stretch. Unlike jeans, these have enough flex that you can easily do squats in them. It’s possible that translates to some stretching out over time, but I’ve been wearing mine for going on a year now and they still fit perfectly.

I love this jacket. It’s the only jacket I’ve ever worn that anyone has complimented me on, which is also the case for another WIRED staffer. Waxed canvas is definitely heavy, but it stands up very well to wear. I’ve had my Trucker Jacket for well over a year and it still looks like new. I don’t need to re-wax it yet, but I have re-waxed other things and it’s dead simple to do. There’s also a wool-lined version, which I have not tried but I do kinda wish I had that instead of the flannel. It’s on sale as well.

Deals on Backpacks, Coffee Brewers, and Other Gear

Courtesy of Huckberry

GoRucks are awesome backpacks, but they aren’t cheap. Here’s a chance to get the GoRuck GR1 for a bit less. This is a collaboration between GoRuck and Huckberry, with branding from both companies on the pack. My favorite thing about the GR1 is its versatility. I have used this pack for plane travel (as a carry-on), rucking, hiking, hauling camera gear, and more. I even strapped it to the back rack of my bike for an overnight bikepacking trip. If you want to ruck with it, grab a weight plate as well.

The Yeti Hopper Flip 12 is a nice little personal-size cooler. Hopper Flip 12 closes with a water proof zipper, which has never leaked on my thus far. With 12 quarts of capacity, it’s not huge. Think a six pack and sandwich, depending on what you use to keep things cold (ice packs are the way to go with this one).

This isn’t a huge discount, but any time you can save some money on Snow Peak it’s a win. The company’s incredibly well-designed gear isn’t cheap. Take this mug, which amounts to a $47 coffee mug. But look, it’s titanium, OK? And it’s double-walled so your coffee stays warm even on those bitter cold mornings at the cabin. (Ed. note: These are editor Adrienne So’s camping mugs and she’s used them for about 10 years now.)

If you’re going to get the mug, you might as well get the French press too.

You see where we’re going here—mug, brewer, and now grinder. Yes, this is a $140 (on sale!) military-grade aluminum and high-carbon stainless steel burr grinder, which, I know, that’s a lot, This is also hands down the best most reliable hand grinder I’ve ever used. Mine is five years old and has stood up to the abuse of years and years of travel without missing a beat. It’s missing a little paint, but otherwise works exactly like the day I got it. On sale, I might add.

Photograph: Peak Design

The Everyday Backpack is one of our favorite camera bags, but it doesn’t have to be that. It’s really just a nice EDC backpack with some well thought out features, like a tuck-away waist strap, three FlexFold dividers, and a nice strap for attaching it to the handle of your rolling carry on bag.

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