Experiments with paper airplanes reveal surprisingly complex aerodynamics

How these gliders keep level flight is different from the stability of airplanes.

Experiments with paper airplanes revealed new aerodynamic effects that enhance our current understanding of flight stability.

Enlarge / Experiments with paper airplanes revealed new aerodynamic effects that enhance our current understanding of flight stability. (credit: RUNSTUDIO/Getty Images)

There's rarely time to write about every cool science-y story that comes our way. So this year, we're once again running a special Twelve Days of Christmas series of posts, highlighting one science story that fell through the cracks in 2022, each day from December 25 through January 5. Today: new insights into the aerodynamics of paper airplanes reveal the key to smooth gliding.

Drop a flat piece of paper and it will flutter and tumble through the air as it falls, but a well-fashioned paper airplane will glide smoothly. Yet these seemingly simple structures involve surprisingly complex aerodynamics. Researchers at New York University’s Courant Institute of Mathematical Sciences conducted a series of experiments involving paper airplanes to explore this transition and develop a mathematical model to predict flight stability, according to a March paper published in the Journal of Fluid Mechanics.

“The study started with simple curiosity about what makes a good paper airplane and specifically what is needed for smooth gliding," said co-author Leif Ristroph. "Answering such basic questions ended up being far from child’s play. We discovered that the aerodynamics of how paper airplanes keep level flight is really very different from the stability of conventional airplanes.”

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MSI Prestige 13 Evo (2023) is a 2.2 pound notebook with Intel Raptor Lake-P

The new MSI Prestige 13 Evo is a thin and light business-class laptop that measures less than 0.7 inches thick and weighs less than 2.2 pounds. But with support for up to a 28-watt, 14-core, 20-thread Intel Core i7-1370P processor, the notebook should…

The new MSI Prestige 13 Evo is a thin and light business-class laptop that measures less than 0.7 inches thick and weighs less than 2.2 pounds. But with support for up to a 28-watt, 14-core, 20-thread Intel Core i7-1370P processor, the notebook should deliver plenty of performance. It also has two Thunderbolt 4 ports, up to […]

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AMD says a “limited number” of 7900 XTX GPUs have a thermal throttling problem

Owners of cards with throttling problems are encouraged to contact AMD support.

The Radeon RX 7900 XTX's three-fan cooler.

Enlarge / The Radeon RX 7900 XTX's three-fan cooler. (credit: Andrew Cunningham)

Nvidia's GeForce RTX 4090 has been through the PR wringer for the last few months because of problems with its power connector, but AMD's newest Radeon cards are proving capable of having issues, too. Some users have been complaining of overheating and thermal throttling in their RX 7900 XTX GPUs, and AMD confirmed that there was an issue in a statement to Tom's Hardware today.

"We are working to determine the root cause of the unexpected throttling experienced by some while using the AMD Radeon RX 7900 XTX graphics cards made by AMD," the statement reads. "Based on our observations to-date, we believe the issue relates to the thermal solution used in the AMD reference design and appears to be present in a limited number of the cards sold."

Independent testing suggests that the overheating issue may be caused by a faulty vapor chamber in the GPU cooler. The problem only appears to affect 7900 XTX models using AMD's reference design, including its fan and heatsink. ASRock, Gigabyte, PowerColor, XFX, and others all offer versions of the XTX with AMD's reference cooler alongside their own custom-designed versions. Versions with custom coolers shouldn't be affected by this specific problem.

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Asus Chromebook Vibe C34 Flip is a gaming convertible with a 144 Hz display and RGB keyboard

A few months after launching its first gaming Chromebook, Asus it introducing a next-gen model steps up its game a bit with an upgraded processor, faster wireless, and updated keyboard, among other improvements. The Asus Chromebook Vibe C34 Flip is al…

A few months after launching its first gaming Chromebook, Asus it introducing a next-gen model steps up its game a bit with an upgraded processor, faster wireless, and updated keyboard, among other improvements. The Asus Chromebook Vibe C34 Flip is also smaller and more versatile – it has a 14 inch display and comes with a USI […]

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TCL NXTPAPER 12 Pro is a 2-in-1 Android tablet with a pen that supports 8192 levels of pressure

The TCL NXTPAPER 12 Pro is 12.2 inch Android tablet designed for use with a keyboard or pressure-sensitive pen. The pen ships standard with the tablet and supports up to 8192 levels of pressure sensitivity, while the detachable keyboard is available a…

The TCL NXTPAPER 12 Pro is 12.2 inch Android tablet designed for use with a keyboard or pressure-sensitive pen. The pen ships standard with the tablet and supports up to 8192 levels of pressure sensitivity, while the detachable keyboard is available as an optional accessory. TCL launched the tablet in Russia last month, but now the […]

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TCL Book X12 Go is a 2-in-1 Windows tablet with a Snapdragon 7c Gen 2 processor

TCL has been making Android phones and tablets for years, but now the company is branching out with a 2-in-1 Windows tablet called the TCL Book X12 Go. It’s a tablet with a 12.2 inch, 2160 x 1440 pixel TCL NXTPAPER display, a Qualcomm Snapdragon…

TCL has been making Android phones and tablets for years, but now the company is branching out with a 2-in-1 Windows tablet called the TCL Book X12 Go. It’s a tablet with a 12.2 inch, 2160 x 1440 pixel TCL NXTPAPER display, a Qualcomm Snapdragon 7c Gen 2 processor, support for up to 8GB of […]

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Ars readers gave over $31,500 in our 2022 Charity Drive

Total charity haul since 2007 tops $465,000.

Giving a little joy.

Enlarge / Giving a little joy. (credit: xJasonRogersx / Flickr)

Last month, we asked readers to donate to a couple of good causes in our 2022 Charity Drive sweepstakes. And boy, did you deliver. With the drive now complete and the donations all tallied, we can report that Ars Technica readers gave an incredible $31,656.07 to Child's Play and the Electronic Frontier Foundation last month. That doesn't set a new record, but it raises our total Ars Charity Drive donation haul since 2007 to over $465,000. Well done, Arsians!

Thanks to everyone who gave whatever they could. We're still early in the process of selecting and notifying winners of our swag giveaway, so don't fret if you haven't heard if you're a winner yet. In the meantime, enjoy these quick stats from the 2021 drive.

  • 2022 Fundraising total: $31,656.07
    • Total given to Child's Play: $13,591.62
    • Total given to the EFF: $18,064.45
  • Number of individual donations: 329
    • Child's Play donations: 167
    • EFF donations: 162
  • Average donation: $96.22
    • Child's Play average donation: $81.39
    • EFF average donation: $66.95
  • Median donation: $51.69
    • Median Child's Play donation: $50.00
    • Median EFF donation: $66.95
  • Top single donation: $1,200 (to EFF)
  • Donations of $1,000 or more: 5
  • Donations of $100 or more: 115
  • $5 or less donations: 9 (every little bit helps!)
  • Total charity donations from Ars Technica drives since 2007 (approximate): $466,782.90
    • 2022: $31,656.07
    • 2021: $40,261.71
    • 2020: $58,758.11
    • 2019: $33,181.11
    • 2018: $20,210.66
    • 2017: $36,012.37
    • 2016: $38,738.11
    • 2015: $38,861.06
    • 2014: $25,094.31
    • 2013: $23,570.13
    • 2012: $28,713.52
    • 2011: ~$26,000
    • 2010: ~$24,000
    • 2009: ~$17,000
    • 2008: ~$12,000
    • 2007: ~$10,000

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Asus updates its mini PC lineup with Raptor Lake, Alder Lake-N, and Chromebox models

Asus is introducing three new compact desktop computers at the Consumer Electronics Show this week. The Asus ExpertCenter PN64-E1 is an updated version of a system the company first introduced a year ago, but now it’s powered by a 13th-gen Intel…

Asus is introducing three new compact desktop computers at the Consumer Electronics Show this week. The Asus ExpertCenter PN64-E1 is an updated version of a system the company first introduced a year ago, but now it’s powered by a 13th-gen Intel Core processor. Meanwhile the Asus ExpertCenter PN42 is the company’s latest fanless, low-power system, now […]

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Hundreds of WordPress sites infected by recently discovered backdoor

People who use WordPress should check their sites for unpatched plugins.

Hundreds of WordPress sites infected by recently discovered backdoor

Enlarge

Malware that exploits unpatched vulnerabilities in 30 different WordPress plugins has infected hundreds if not thousands of sites and may have been in active use for years, according to a writeup published last week.

The Linux-based malware installs a backdoor that causes infected sites to redirect visitors to malicious sites, researchers from security firm Dr.Web said. It’s also able to disable event logging, go into standby mode, and shut itself down. It gets installed by exploiting already-patched vulnerabilities in plugins that website owners use to add functionality like live chat or metrics-reporting to the core WordPress content management system.

“If sites use outdated versions of such add-ons, lacking crucial fixes, the targeted web pages are injected with malicious JavaScripts,” Dr.Web researchers wrote. “As a result, when users click on any area of an attacked page, they are redirected to other sites.”

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Twitter Hit With $228.9m Copyright Infringement / Repeat Infringer Lawsuit

Celebrity photo agency Backgrid has filed a $228.9m copyright infringement lawsuit against Twitter after thousands of its photographs were uploaded by users of the social media site. Ordinarily, Twitter would enjoy ‘safe harbor’ protection but according to Backgrid, Twitter failed to take action in response to DMCA takedown notices, and failed to terminate ‘repeat infringers’

From: TF, for the latest news on copyright battles, piracy and more.

pirate twitterAny platform that allows users to upload and share content runs the risk of some users uploading content for which they hold no rights.

Under copyright law, platforms can limit liability for the actions of their users provided they respond to DMCA takedown notices in a timely fashion and suspend or terminate users who repeatedly infringe copyright.

If a platform fails in either respect, rightsholders may attempt to hold it liable for infringements that it had the ability to stop, but failed to do so.

Celebrity Photo Agency Sues Twitter

On December 30, 2022, celebrity photo agency Backgrid filed a lawsuit against Twitter at the U.S. District Court for the Central District of California.

The complaint alleges that Backgrid sent more than 6,700 DMCA notices to Twitter requesting the removal of its copyrighted images, but Twitter failed to take down a single one. Backgrid further alleges that its images were posted continuously by some Twitter users, but Twitter failed to suspend any accounts under its ‘repeat infringer’ policy.

The complaint notes that Backgrid attempted to resolve its dispute with Twitter directly, but when the company failed to respond, the photo agency launched this action.

Backgrid: No Action in Response to DMCA Notices

The complaint describes Backgrid as “the world’s premier celebrity-related photograph agency.” The company says that its celebrity images are regularly licensed by publications including Vogue, Ella, TMZ, and Harper’s Bazaar. Backgrid says that websites using its copyrighted and registered celebrity images increase their traffic and viewer engagement.

According to the complaint, Twitter receives similar benefits when users upload Backgrid images to the platform, but when those images are unlicensed, Twitter must take action to prevent further infringement. Backgrid alleges that in thousands of cases, Twitter did nothing.

“Despite having received DMCA notices from Backgrid, Twitter has not expeditiously taken down Backgrid’s Celebrity content,” the complaint notes. “For example, Backgrid sent over 6,700 DMCA notices, but Twitter has not expeditiously taken down content in response to the same and cannot seek protection under the DMCA.”

Complaint Details Specific Accounts’ Alleged Infringements

Twitter accounts that allegedly posted Backgrid content on multiple occasions are mentioned directly in the complaint. The first named account in the lawsuit (@BSO) is of immediate interest since it belongs to Robert Littal, former co-host of the TMZ Sports show and founder/editor of news site BlackSportsOnline.com.

robert littal

The complaint alleges that the account was targeted by 73 DMCA notices in connection with 49 copyrighted Backgrid images, posted between September 2021 and November 2022. (small sample below)

backgrid sample1

Checks on two dozen links reveal that all remain intact, as does the account.

The second named account (@foochia) is operated by the news site Foochia.com. It describes itself as a platform “concerned with the affairs and concerns of Arab women, from which we look at the world of fashion, beauty, grace and elegance, and we follow celebrity news, art and culture.”

foochia

“Backgrid sent Twitter at least 101 DMCA take-down notifications encompassing at least 42 timely registered photographs on the ‘foochia’ account,” the complaint reads.

DMCA notices cover the same September 2021 to November 2022 period, and the related URLs on Twitter seem intact. The tweets contain images of celebrities including Kanye West, Justin Beiber, Rihanna, Kendall Jenner, and Jennifer Lopez, among others.

“Notwithstanding the receipt of the take-down notices described herein, the ‘foochia’ account remains live and active,” the complaint notes.

Repeat Infringer Allegations

Twitter’s copyright policy states that the company responds to copyright complaints submitted under the DMCA and under certain conditions may take action against user accounts.

“If multiple copyright complaints are received about an account, or other evidence suggests a pattern of repeat infringement, Twitter may suspend that account in accordance with our Repeat Infringer Policy. Our Repeat Infringer Policy takes valid retractions and counter-notices into account,” Twitter’s policy reads.

To benefit from limitations on liability under the DMCA (17 U.S. Code § 512), services providers like Twitter must have “adopted and reasonably implemented” a policy that provides for the termination in “appropriate circumstances” of subscribers who are “repeat infringers.”

The terms reasonable, appropriate, and repeat are not clearly defined in law, so Backgrid offers its own guidelines for the court’s consideration.

“Industry standard practices have resulted in the widespread adoption and implementation by legitimate ISPs of a ‘three-strikes’ policy with respect to repeat infringers,” Backgrid says.

“The industry standard requires that to qualify for the DMCA safe harbor protection, ISPs must terminate the accounts of users that have been the subject of three infringement complaints. Defendant, however, regularly fails and refuses to comport with the industry standard.

“Stunningly, all of the accounts remain live and online today while Twitter continues to profit from the blatant, repeated, and ongoing infringements of the copyrighted works of others, including without limitation the timely registered Celebrity Photographs [in suit],” the complaint adds.

“Direct, Contributory, and Vicarious Infringement”

According to the lawsuit, Twitter infringed “at least 1,526” of Backgrid’s celebrity images, with infringement “continuous and on-going.”

Backgrid alleges direct infringement due to Twitter failing to remove images “long after being apprised of their infringing status” and contributory infringement for encouraging users to upload and edit photographs found on the internet, failing to advise users of the consequences, and for removing metadata from the images.

“Defendant is aware of the massive scale of copyright infringement it facilitates and encourages, and of the revenue and profits such infringement generates for it,” the image company adds.

Backgrid seeks a declaration that Twitter infringes its copyrights and an injunction under 17 U.S.C. § 502 to prevent any further acts of infringement.

Based on its allegations that Twitter neither adopted nor reasonably implemented a repeat infringer policy, Backgrid requests a declaration that Twitter is liable for each of the works infringed on its platform.

Describing Twitter’s infringement as willful and egregious, Backgrid believes it’s entitled to maximum statutory damages of $150,000 per image – $228.9 million in total.

Backgrid’s complaint can be found here (1,2, pdf)

From: TF, for the latest news on copyright battles, piracy and more.