Here at Ars, we're suckers for stories about hackers getting Doom running on everything from CAPTCHA robot checks and Windows' notepad.exe to AI hallucinations and fluorescing gut bacteria . Despite all that experience, we were still thrown for a loop by a recent demonstration of Doom running in the usually static confines of a PDF file .

On the Github page for the quixotic project , coder ading2210 discusses how Adobe Acrobat included some robust support for JavaScript in the PDF file format. That JS coding support—which dates back decades and is still fully documented in Adobe's official PDF specs—is currently implemented in a more limited, more secure form as part of PDFium , the built-in PDF-rendering engine of Chromium-based browsers.

In the past, hackers have used this little-known Adobe feature to code simple games like Breakout and Tetris into PDF documents. But ading220 went further, recompiling a streamlined fork of Doom 's open source code using an old version of Emscripten that outputs optimized asm.js code.

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Here at Ars, we're suckers for stories about hackers getting Doom running on everything from CAPTCHA robot checks and Windows' notepad.exe to AI hallucinations and fluorescing gut bacteria . Despite all that experience, we were still thrown for a loop by a recent demonstration of Doom running in the usually static confines of a PDF file .

On the Github page for the quixotic project , coder ading2210 discusses how Adobe Acrobat included some robust support for JavaScript in the PDF file format. That JS coding support—which dates back decades and is still fully documented in Adobe's official PDF specs—is currently implemented in a more limited, more secure form as part of PDFium , the built-in PDF-rendering engine of Chromium-based browsers.

In the past, hackers have used this little-known Adobe feature to code simple games like Breakout and Tetris into PDF documents. But ading220 went further, recompiling a streamlined fork of Doom 's open source code using an old version of Emscripten that outputs optimized asm.js code.

Read full article

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Here at Ars, we're suckers for stories about hackers getting Doom running on everything from CAPTCHA robot checks and Windows' notepad.exe to AI hallucinations and fluorescing gut bacteria . Despite all that experience, we were still thrown for a loop by a recent demonstration of Doom running in the usually static confines of a PDF file .

On the Github page for the quixotic project , coder ading2210 discusses how Adobe Acrobat included some robust support for JavaScript in the PDF file format. That JS coding support—which dates back decades and is still fully documented in Adobe's official PDF specs—is currently implemented in a more limited, more secure form as part of PDFium , the built-in PDF-rendering engine of Chromium-based browsers.

In the past, hackers have used this little-known Adobe feature to code simple games like Breakout and Tetris into PDF documents. But ading220 went further, recompiling a streamlined fork of Doom 's open source code using an old version of Emscripten that outputs optimized asm.js code.

Read full article

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Tires might be one of the more prosaic parts of a car, but they are undoubtedly among the most important. Bench racers might obsess about powertrain specs, and average consumers mostly want to know that there's wireless charging for their phones , but it's the tires that actually make contact with the road. Without them, no one is going anywhere. At least not very far.

In the past, tires have been considered somewhat mysterious, with secret blends of rubber, carbon, and other stuff combined with clever arrangements of belts and wires to hold the whole thing together as it rotates faster and faster without flying apart. These days, we know an awful lot about how tires work. Or at least tire companies like Goodyear do, having amassed enough testing data to be able to simulate them accurately enough to shave months off a development schedule.

In fact, the use of simulation in tire research and development has quite a long history. Chris Helsel, who is now Goodyear's CTO, joined the company back in 1996; he was hired as part of a tiny team doing computer tire simulation. "At Goodyear in '96, it felt like almost late to the party in terms of doing what we call finite element analysis, which is basically breaking a large structure down into little parts," Helsel said.

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Tires might be one of the more prosaic parts of a car, but they are undoubtedly among the most important. Bench racers might obsess about powertrain specs, and average consumers mostly want to know that there's wireless charging for their phones , but it's the tires that actually make contact with the road. Without them, no one is going anywhere. At least not very far.

In the past, tires have been considered somewhat mysterious, with secret blends of rubber, carbon, and other stuff combined with clever arrangements of belts and wires to hold the whole thing together as it rotates faster and faster without flying apart. These days, we know an awful lot about how tires work. Or at least tire companies like Goodyear do, having amassed enough testing data to be able to simulate them accurately enough to shave months off a development schedule.

In fact, the use of simulation in tire research and development has quite a long history. Chris Helsel, who is now Goodyear's CTO, joined the company back in 1996; he was hired as part of a tiny team doing computer tire simulation. "At Goodyear in '96, it felt like almost late to the party in terms of doing what we call finite element analysis, which is basically breaking a large structure down into little parts," Helsel said.

Read full article

Comments

Tires might be one of the more prosaic parts of a car, but they are undoubtedly among the most important. Bench racers might obsess about powertrain specs, and average consumers mostly want to know that there's wireless charging for their phones , but it's the tires that actually make contact with the road. Without them, no one is going anywhere. At least not very far.

In the past, tires have been considered somewhat mysterious, with secret blends of rubber, carbon, and other stuff combined with clever arrangements of belts and wires to hold the whole thing together as it rotates faster and faster without flying apart. These days, we know an awful lot about how tires work. Or at least tire companies like Goodyear do, having amassed enough testing data to be able to simulate them accurately enough to shave months off a development schedule.

In fact, the use of simulation in tire research and development has quite a long history. Chris Helsel, who is now Goodyear's CTO, joined the company back in 1996; he was hired as part of a tiny team doing computer tire simulation. "At Goodyear in '96, it felt like almost late to the party in terms of doing what we call finite element analysis, which is basically breaking a large structure down into little parts," Helsel said.

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The Securities and Exchange Commission sued Elon Musk yesterday over his late disclosure of a Twitter stock purchase in early 2022. Before Musk bought the whole company, he purchased a 9 percent stake in Twitter and failed to disclose it within 10 days as required under US law.

"Defendant Elon Musk failed to timely file with the SEC a beneficial ownership report disclosing his acquisition of more than five percent of the outstanding shares of Twitter's common stock in March 2022, in violation of the federal securities laws," said the SEC lawsuit in US District Court for the District of Columbia. "As a result, Musk was able to continue purchasing shares at artificially low prices, allowing him to underpay by at least $150 million for shares he purchased after his beneficial ownership report was due."

Twitter's stock price rose 27 percent once Musk belatedly disclosed his stake, the lawsuit said. "During the period that Musk was required to publicly disclose his beneficial ownership but had failed to do so, he spent more than $500 million purchasing additional shares of Twitter common stock," it said.

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The Securities and Exchange Commission sued Elon Musk yesterday over his late disclosure of a Twitter stock purchase in early 2022. Before Musk bought the whole company, he purchased a 9 percent stake in Twitter and failed to disclose it within 10 days as required under US law.

"Defendant Elon Musk failed to timely file with the SEC a beneficial ownership report disclosing his acquisition of more than five percent of the outstanding shares of Twitter's common stock in March 2022, in violation of the federal securities laws," said the SEC lawsuit in US District Court for the District of Columbia. "As a result, Musk was able to continue purchasing shares at artificially low prices, allowing him to underpay by at least $150 million for shares he purchased after his beneficial ownership report was due."

Twitter's stock price rose 27 percent once Musk belatedly disclosed his stake, the lawsuit said. "During the period that Musk was required to publicly disclose his beneficial ownership but had failed to do so, he spent more than $500 million purchasing additional shares of Twitter common stock," it said.

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The Securities and Exchange Commission sued Elon Musk yesterday over his late disclosure of a Twitter stock purchase in early 2022. Before Musk bought the whole company, he purchased a 9 percent stake in Twitter and failed to disclose it within 10 days as required under US law.

"Defendant Elon Musk failed to timely file with the SEC a beneficial ownership report disclosing his acquisition of more than five percent of the outstanding shares of Twitter's common stock in March 2022, in violation of the federal securities laws," said the SEC lawsuit in US District Court for the District of Columbia. "As a result, Musk was able to continue purchasing shares at artificially low prices, allowing him to underpay by at least $150 million for shares he purchased after his beneficial ownership report was due."

Twitter's stock price rose 27 percent once Musk belatedly disclosed his stake, the lawsuit said. "During the period that Musk was required to publicly disclose his beneficial ownership but had failed to do so, he spent more than $500 million purchasing additional shares of Twitter common stock," it said.

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