Enlarge / This is essentially the kind of water heater the author has hooked up, minus the Wi-Fi module that led him down a rabbit hole. Also, not 140-degrees F—yikes. (credit: Getty Images)

The hot water took too long to come out of the tap. That is what I was trying to solve. I did not intend to discover that, for a while there, water heaters like mine may have been open to anybody. That, with some API tinkering and an email address, a bad actor could possibly set its temperature or make it run constantly. That’s just how it happened.

Let’s take a step back. My wife and I moved into a new home last year. It had a Rinnai tankless water heater tucked into a utility closet in the garage. The builder and home inspector didn't say much about it, just to run a yearly cleaning cycle on it.

Because it doesn’t keep a big tank of water heated and ready to be delivered to any house tap, tankless water heaters save energy—up to 34 percent, according to the Department of Energy. But they're also, by default, slower. Opening a tap triggers the exchanger, heats up the water (with natural gas, in my case), and the device has to push it through the line to where it's needed.

Enlarge / GM used a Silverado EV to power a 10,000-square-foot house as a demo of its Home Energy system. (credit: General Motors)

LOS ANGELES—Let's face it: The American power grid is a hot mess. The system is outdated and overstressed by amp-sucking appliances, air conditioning units, and extreme weather. Depending on where you live, it's likely only a matter of time before your home will experience a blackout. GM Energy, a subsidiary of General Motors, is here to help.

At a demonstration in a swanky 10,000-square-foot mansion in Beverly Hills, California, where I counted 51 recessed lights in the great room, the new home products from GM Energy easily kept the electrons flowing, eschewing the grid and drawing power from the 200 kWh battery in a 2024 Chevrolet Silverado RST.

It all starts with the GM Energy PowerShift charger. On an 80 A circuit, the charger can charge your EV at a whopping 19.2 kW, and its bi-directional technology can push electrons from the truck's battery into an inverter to convert it to the AC power your home requires. The happy little AC current then goes into the Home Hub that distributes the power to the appropriate circuits, and voilà—the lights are on.

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A study analyzing Apple, Microsoft, and SpaceX suggests that return to office (RTO) mandates can lead to a higher rate of employees, especially senior-level ones, leaving the company, often to work at competitors.

The study (PDF), published this month by University of Chicago and University of Michigan researchers and reported by The Washington Post on Sunday, says:

In this paper, we provide causal evidence that RTO mandates at three large tech companies—Microsoft, SpaceX, and Apple—had a negative effect on the tenure and seniority of their respective workforce. In particular, we find the strongest negative effects at the top of the respective distributions, implying a more pronounced exodus of relatively senior personnel.

The study looked at résumé data from People Data Labs and used "260 million résumés matched to company data." It only examined three companies, but the report's authors noted that Apple, Microsoft, and SpaceX represent 30 percent of the tech industry's revenue and over 2 percent of the technology industry's workforce. The three companies have also been influential in setting RTO standards beyond their own companies. Robert Ployhart, a professor of business administration and management at the University of South Carolina and scholar at the Academy of Management, told the Post that despite the study being limited to three companies, its conclusions are a broader reflection of the effects of RTO policies in the US.

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After reversing its position on remote work, Dell is reportedly implementing new tracking techniques on May 13 to ensure its workers are following the company's return-to-office (RTO) policy, The Register reported today, citing anonymous sources.

Dell has allowed people to work remotely for over 10 years. But in February, it issued an RTO mandate, and come May 13, most workers will be classified as either totally remote or hybrid. Starting this month, hybrid workers have to go into a Dell office at least 39 days per quarter. Fully remote workers, meanwhile, are ineligible for promotion, Business Insider reported in March.

Now The Register reports that Dell will track employees' badge swipes and VPN connections to confirm that workers are in the office for a significant amount of time.