Although not technically the first virtual pet, the Tamagotchi handhelds certainly popularized the idea and made it a worldwide phenomenon. In the late 90s it was hard to go out in public and not see them dangling from backpacks and belt loops. They turned out to be more than a passing fad, too. There have been Tamagotchis in various forms since then, and one of the latest, the Tamagotchi Paradise, is uniquely hackable thanks to this custom UART interface.

The build starts with a simple and inexpensive CH340G UART adapter with a built-in USB interface. A custom 3D printed enclosure is used to house the adapter and also help to expose the interface to the Tamagotchi. This is done by wiring three pins to nickel strips, which are threaded through slits in the case and looped back around to create a pogo-style adapter for the Tamagotchi’s custom dock. Normally this would be used to link to other Tamagotchis, but in this case the USB-to-UART adapter mimics it, allowing for all kinds of in-game shenanigans. The project’s creator [Squalius] shows it off by connecting it directly to a browser tool in Google Chrome.

Not only that, but this can also be used to modify the software running on the handheld entirely, with the video showing demos playing not only Super Mario but also DOOM (of course). This isn’t too surprising given that these games are built with modern 32-bit ARM microcontrollers. For the 90s purists, though, it probably won’t surprise anyone to know that these devices have been the subject of various hacks almost since they came out.

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Up to a quarter of active-duty Army members could receive a low testosterone result from mandatory military screening, despite the true prevalence of the condition likely being a tiny fraction of that figure, according to a study published Thursday in JAMA.

The finding adds to concerns that the mandatory screening announced by Defense Secretary Pete Hegseth in July will lead to a cascade of unnecessary medical evaluations for military members. Those evaluations could result in inappropriate testing, inaccurate results and diagnoses, and overtreatment that could cause harm, including infertility. Medical experts, including the Endocrine Society and the American Urological Association (AUA), have recommended against blanket screenings for these reasons. Still, the Pentagon has moved forward with the plans, releasing clinical guidance in September.

The JAMA study highlights the reasons why testosterone levels are not measured in men without symptoms—and also offers a glimpse of how many Army members could become ensnared in the clinically dubious screenings.

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