Styropyro has established a name for himself by pushing seemingly ordinary technology to its limits, and in this experiment, he demonstrates some of the fundamental physics at work in its most obvious form. He simply takes car ignition coils, the typical transformers that ignite a spark in your engine, and directs their output to a large blank circuit board.

Those car ignition coils can take a low battery voltage and provide a nice huge kick of tens of thousands of volts, exactly enough to bridge the gap that ignites your fuel in an engine. Styropyro has modified his coils to produce even more voltage than they normally would, and he has connected the high-voltage connections to a perfboard, which is a board with many holes and copper pads in a grid.

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The problem is that electricity prefers the shortest path to ground. If you’re out in the open, just take the shortest straight line and you’ll get a nice clean spark, but with a board like this in the mix, things change. The small copper rings and holes in a grid alter the game completely. Because each ring provides a lower-resistance path for the electricity to follow along the grid lines, which is much easier than jumping across empty space in a straight line. So the arc of electricity begins to spread out, making right-angle turns and following the grid lines as it travels.

Threads of blazing light snaking across the surface form complicated, maze-like patterns. The reason these strange patterns appear is that the electricity is compelled to follow the longer path, which allows it to reach ground with the least amount of air to leap. It lingers like that for quite some time, hypnotizing you with its flashing, branching arcs against the static board.

Styropyro keeps things simple, with no special components on the board and no sophisticated drivers other than what pushes the coils themselves. It’s just a fast clip that highlights the moment when everything comes together rather than fussing with it for hours. The light from the arcs acts like a half-dozen tiny spotlights, illuminating every twist and turn of the paths they traverse, throwing crisp shadows and bringing the entire scene to life.

Coruna is also notable for its use by three distinct hacking groups. Google first detected its use in February of last year in an operation conducted by a “customer of a surveillance vendor.” The vulnerability exploited, tracked as CVE-2025-23222, had been patched 13 months earlier. In July 2025, a “suspected Russian espionage group” exploited CVE-2023-43000 in attacks planted on websites that were frequented by Ukrainian targets. Last December, when it was used by a “financially motivated threat actor from China,” Google was able to retrieve the complete exploit kit.

“How this proliferation occurred is unclear, but suggests an active market for ‘second hand’ zero-day exploits,” Google wrote. “Beyond these identified exploits, multiple threat actors have now acquired advanced exploitation techniques that can be re-used and modified with newly identified vulnerabilities.”

Google researchers went on to write:

We retrieved all the obfuscated exploits, including ending payloads. Upon further analysis, we noticed an instance where the actor deployed the debug version of the exploit kit, leaving in the clear all of the exploits, including their internal code names. That’s when we learned that the exploit kit was likely named Coruna internally. In total, we collected a few hundred samples covering a total of five full iOS exploit chains. The exploit kit is able to target various iPhone models running iOS version 13.0 (released in September 2019) up to version 17.2.1 (released in December 2023).

The 23 exploits, along with the code names and other information, are:

CISA is adding only three of the CVEs to its catalog. They are:

• CVE-2021-30952 Apple Multiple Products Integer Overflow or Wraparound Vulnerability
• CVE-2023-41974 Apple iOS and iPadOS Use-After-Free Vulnerability
• CVE-2023-43000 Apple Multiple products Use-After-Free Vulnerability

CISA is directing agencies to “apply mitigations per vendor instructions, follow applicable… guidance for cloud services, or discontinue use of the product if mitigations are unavailable.” The agency went on to warn: “These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise.”

Modern-day receivers are miracles of digital audio and video processing, but compared to their more analog brethren, they can come with a host of new and fascinating faults. The Onkyo TX-SA806 and SR806 receivers were released back in 2008, with [Tony359] recently getting the latter variant in for repair. Described as having weird digital distortion on the audio outputs, this particular issue got fixed by recapping the PCB with all the digital processing in the first video on this receiver, but this left the second issue unaddressed of a persistent hum, which is the topic of the second video on this repair.

With the easy fix of recapping of the digital board already tried, next was a deep-dive into the receiver’s schematics to figure out where this low-frequency hum was coming from. With it sounding very much like mains frequency hum bleeding through, this was the starting point. Presumably somewhere on the power rails the normal filtering had broken down, so all rails had to be identified and checked for this interference.

With ripple on the 10V and 12V rails as well as the others seemingly in order, it wasn’t clear where the 100 Hz hum was coming from, but people on the BadCaps forum offered some help. After some back and forth it was deduced that the problem was the +15 VA rail, with heavy ripple on it due to a dead capacitor on the +22 V rail that comes straight from a transformer.

For some reason Onkyo’s engineer and/or bean counters had decided that installing an 85°C electrolytic capacitor on the opposite PCB side of a bridge rectifier was a genius idea, which turned out to be not quite the case. With the capacitor eventually giving up on life, the mains hum was allowed to freely pass onto the analog voltage rail and from there into the outputs.

Of course, getting to the target C5662 capacitor was anything but easy, as these modern receivers are tightly packed sandwiches of PCBs, requiring basically a full disassembly. Upon getting to C5662 it was clear that the capacitor was bad, being visibly bulged. Despite being a quality Japanese Nichicon capacitor, such an abusive environment was simply too much. With more similarly poorly spec’ed capacitors at risk of the same fate, these were all replaced with 105°C rated electrolytics.

Perhaps unsurprisingly this fixed the mains hum on the outputs, returning this receiver back to full functionality. In some ways it’s good to know that even with these modern receivers the most typical fault is still due to electrolytic capacitors.

The Nuclear Regulatory Commission (NRC) gave TerraPower the go-ahead this week to build a new nuclear reactor in the shadow of an aging coal power plant in Wyoming.

TerraPower’s permit is the first to be issued by the NRC in nearly a decade. The startup — founded by Bill Gates in 2015 and backed by Nvidia — has been designing its Natrium reactor with GE Vernova Hitachi. The final power plant will generate 345 megawatts, which is about two-thirds smaller than modern full-size reactors, but multiple times larger than many small modular reactor designs favored by other startups.

Natrium differs from other reactors not just in scale, but also in the details of its design. Where most nuclear reactors built in the last 50 years have been cooled by water, Natrium is cooled by molten sodium, which TerraPower says should be safer. This is the first time a commercial reactor that is not cooled by regular water has been approved by the NRC in more than 40 years.

The reactor will operate with an excess of molten sodium, which will be stored in large, insulated tanks. This allows atoms to keep splitting when demand is low, with the hot sodium saving that energy, which can be used to fill in any lulls in wind and solar output. Since nuclear power plants operate best near full capacity, storing excess energy as heat should help lower generating costs.

The NRC’s approval is notable because TerraPower followed the long-established permitting process, giving it permission to build on private property. The Department of Energy recently loosened its safety rules, but those regulations only apply to land owned by the agency.

TerraPower is one of nearly half a dozen nuclear startups backed by tech companies or their founders. As electricity demand from data centers grows, the Trump administration has come under pressure to boost generating capacity, including by building new nuclear reactors.

Investors have taken note of the two trends, and in recent months, they’ve showered nuclear startups with well over $1 billion in capital. TerraPower alone has raised a total of $1.7 billion, including a $650 million round that closed in June, according to PitchBook.

Despite the momentum, nuclear power still faces an uphill battle. To date, nuclear has been one of the most expensive forms of new generating capacity. Part of that is due to cost overruns at massive power plants, but it also reflects the tremendous strides that solar, wind, and batteries have made in bringing costs down over the years. 

Nuclear startups are hoping to leverage mass manufacturing to rein in capital expenditures, but the theory has yet to be proven. And while manufacturing can help cut costs, it often takes at least a decade for the savings to materialize.

The Occupational Safety and Health Administration has opened an investigation into the death of a worker at a Rivian warehouse in Illinois this week, the federal agency told TechCrunch on Friday. The agency said the probe could take up to six months.

The man, identified by local authorities as 61-year-old Kevin Lancaster, reportedly died from “blunt traumatic compressional injuries” after getting pinned between a tractor trailer and a loading dock at the facility, which is located just a few miles from Rivian’s factory.

Lancaster was reportedly trapped in that spot for around 20 minutes on Thursday before firefighters were able to get to him, according to one local news report. Emergency crews responded to a call at 1:40 p.m. local time, and Lancaster was pronounced dead at a local medical center at 2:33 p.m. local time. The Normal Police Department and the McLean County Coroner are still investigating Lancaster’s death, according to the report.

“Safety at our facilities is our top priority. Unfortunately yesterday afternoon, a contractor passed away after an incident at our warehouse,” Rivian said in a statement to TechCrunch. “Our sympathy and thoughts are with their family and friends. We are working with the Normal Police Department on its investigation.”

The safety of Rivian’s factory in Normal, Illinois, became a source of scrutiny in 2024 after a Bloomberg News report detailed 16 “serious” violations levied on the company across that year and the one prior.

Automotive factories are notoriously dangerous, though, and Rivian has received just one violation at the Illinois manufacturing plant since that report was published. OSHA even told Bloomberg at the time that Rivian “has improved their safety and health team and are very cooperative with the OSHA process.”

Rivian assembles its flagship R1 pickup truck, R1 SUV, and commercial electric van, known as the EDV, at its 4.3-million-square-foot factory in Normal. The company is expanding the space by another 1.1 million square feet to make room for its next EV, the R2. Once complete, the factory will have capacity to assemble 215,000 vehicles.

This story has been updated with a comment from Rivian.

Watch Mansfield vs Arsenal live streams as the League One club look to add to their list of 2025/26 FA Cup upsets by eliminating the Premier League leaders and reaching the quarterfinals for the first time since 1969.

After scraping past Harrogate and Accrington Stanley, it seemed unlikely that Mansfield would embark on a memorable FA Cup run, but after a thrilling 4-3 third-round win over second-tier Sheffield United, the Stags knocked out top-flight Burnley in the fourth. A home tie against top-flight table toppers the Gunners is the reward for Stags boss Nigel Clough, who reached the 1991 final as a player for Nottingham Forest under legendary father Brian’s unique management.