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The Mysterious Math Behind the Brazilian Butt Lift

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The Mysterious Math Behind the Brazilian Butt Lift


In the history of gluteal enhancement, Mexico City stands out. It protrudes. It was here, in 1979, that a plastic surgeon, Mario González-Ulloa, first installed a pair of silicone implants designed specifically for the buttocks. The textbook Body Sculpting with Silicone Implants calls González-Ulloa the “grandfather of buttock augmentation.” The early 2000s saw a new generation of Mexico City buttock transformation luminaries, notably Ramón Cuenca-Guerra. In his 2004 paper “What Makes Buttocks Beautiful?” Cuenca-Guerra laid out four characteristics that “determine attractive buttocks” as well as the five types of “defects,” with strategies for correcting each one. I, for instance, have defect type 5, the “senile buttock.” (González-Ulloa’s depiction of this took the form of charcoal nudes contrasting “the typical ‘happy buttock’”—high, rounded, dimpled—with its counterpart, the low-slung, drooping “sad buttock.”)

While I understand the value of standardizing procedures and setting guidelines for surgical practice, I tripped over Cuenca-Guerra’s methodology. How and by whom had the determinants been determined? Like this: 1,320 photographs of “nude women ages 20 to 35 years, as seen from behind” were presented to a panel of six plastic surgeons, who “pointed out which buttocks they considered attractive and harmonious, and features on which this attractiveness depended.” Oho!

I thought it would be interesting to talk to Cuenca-Guerra about the notion of a visually ideal female figure. As something that could or should be surgically created (or, in the case of the senile buttock, re-created). As something that even exists. I sent an email using the address on a more recent journal paper. There was no reply. Ramón Cuenca-Guerra’s buttocks are in worse shape than mine. He has been dead for some time. I was able to reach a colleague of his, José Luis Daza-Flores. Here was the third generation; just as Cuenca-Guerra had studied under González-Ulloa, Daza-Flores had studied under Cuenca-Guerra, extending the lineage and making Daza-Flores, I guess, “the son of buttock augmentation.”

Daza-Flores collaborated with Cuenca-Guerra on a paper called “Calf Implants,” in which the team did for the lower leg what Cuenca-Guerra had done for the butt: laid out “the anatomical characteristics that make calves look attractive” and the “defects” to be addressed. Here again, plastic surgeons were recruited to judge images—2,600 of them, a vast photographic millipede of female legs.

The paper took an unexpected turn. Referring to a marked-up photograph of a lower leg deemed attractive, the authors tried to show that its measurements conformed to what is known in mathematics as the divine proportion (or golden ratio)—1.6 (I’m rounding it off) to 1. When you divide a line into two parts such that the whole length divided by the long part is equal to the long part divided by the short part, both those ratios will be 1.6 to 1. I found an illustration of the divine proportion on a website called Math Is Fun (and convincing no one). The golden dividing line splits the length such that one chunk is roughly two-thirds and the other is around one-third. The ancient Greeks divided the “ideal” face into similarly proportioned thirds. This was the first time I’d seen the divine proportion applied to a leg.

The paper contained sentences like this: “Seventeen women had thin legs, in the shape of a tube, and a mere 1:1.618 ratio in the A-P and L-L projections.” Though I confess to not grasping the particulars of the discussion, I believe that to be a mathematically precise description of cankles.



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What does OpenAI’s restructuring mean for the future of the AI industry?

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What does OpenAI’s restructuring mean for the future of the AI industry?


Credit: Unsplash/CC0 Public Domain

OpenAI’s recent restructuring of its for-profit arm to a public benefit corporation is a smart move that will allow the organization to increase its investment opportunities and maintain its nonprofit roots, according to a Northeastern University nonprofit management expert.

“They are still keeping their nonprofit legacy intact in many ways,” says Cortney Nicolato, a Northeastern lecturer and president and chief executive of the United Way of Rhode Island, a branch of a global nonprofit that provides and funds social service programs to people in need.

OpenAI recently announced after months of negotiations between attorneys general in Delaware, where it was incorporated, and California, where it is currently based, that it had changed the organization’s structure.

As part of the reorganization, OpenAI, the well-known AI technology company, changed its for-profit business into a public benefit corporation. A public benefit corporation is a type of for-profit business that, in addition to having shareholders, has committed to pursuing societal causes.

OpenAI’s recently renamed nonprofit arm, the OpenAI Foundation, has a 26% equity stake in the company. Microsoft, which has long been one of the company’s biggest supporters, has a 27% equity stake in the company. The other 47% is owned by employees, previous employees, and current and new investors, according to an OpenAI blog post.

Nicolato says OpenAI’s pivot to a public benefit corporation makes sense as it is increasingly becoming one of the more popular business models for companies looking to make societal changes.

Similarly, Anthropic, another AI company, is a public benefit corporation.

Other companies that follow a similar structure are Bombas, which in addition to selling socks, also gives them away; Toms Shoes, which gives away a free pair of shoes for every pair sold. They are what are known as B Corporations, which, similar to public benefit corporations, have a social component to their for-profit businesses.

“There are a lot more B Corps now than there were before,” says Nicolato. “So I’m not surprised that they went this route because it offers more opportunity to license out products.”

At the same time, however, given that the nonprofit’s arm retains a large stake in the private arm, it means it is still acting as a check on the organization as a whole, she says.

In addition to the restructuring, OpenAI announced that it is investing $25 billion for the nonprofit arm to focus on two specific areas—health care and AI resilience.

“I think what they’ve done with their nonprofit arm is really hone exactly what that nonprofit will be focused on,” she says.

But why did OpenAI do this restructuring in the first place? What are the economic benefits?

Gastón de los Reyes, an and strategy professor at Northeastern University, says this new restructuring significantly increases OpenAI’s capital investment opportunities as it continues to spend billions on the development of its AI technologies.

“What this change allows is for a lot more investors to be able to make huge amounts of money by owning a share of OpenAI,” he says.

Specifically, this new structure positions OpenAI for a potential initial public offering and removes a previous profit cap for investors, he explains.

“The floodgates of the capital have been opened to keep this arms race going between OpenAI, Google and Anthropic,” he says, highlighting the companies’ pursuit of , a form of AI that is cognitively as capable or more capable than humans.

Notably, OpenAI was incentivized to create the new corporate structure to take full advantage of an investment from the Japanese conglomerate Softbank, de los Reyes says.

Speaking to the nonprofit’s now massive $130 billion stake in the for-profit arm, Craig Welton, also a Northeastern lecturer and the chief development officer of the Boys and Girls Clubs of Dorchester, a local branch of the national after-school organization, says the potential societal benefits are massive.

“It will probably be the most well-funded foundation in the country when it’s all said and done,” he says.

Whether the organization actually lives up to its goals will certainly depend on its nonprofit and for-profit boards in maintaining OpenAI’s stated missions and goals, he says.

This story is republished courtesy of Northeastern Global News news.northeastern.edu.

Citation:
What does OpenAI’s restructuring mean for the future of the AI industry? (2025, November 10)
retrieved 10 November 2025
from https://techxplore.com/news/2025-11-openai-future-ai-industry.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
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Security flaws in portable genetic sequencers risk leaking private DNA data

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Security flaws in portable genetic sequencers risk leaking private DNA data


Credit: Mikhail Nilov from Pexels

Portable genetic sequencers used around the world to sequence DNA have critical, previously unreported security vulnerabilities that could reveal or alter genetic information without detection, according to a new study.

Researchers from the University of Florida have, for the first time, exposed these security risks in devices from Oxford Nanopore Technologies, which produces nearly all the portable genetic sequencers in the world.

Alerted by the , Oxford Nanopore Technologies has rolled out updated software to patch the vulnerabilities. But out-of-date software, or unsecured internet systems, could still leave some DNA sequencers vulnerable to attack.

“No one in the world had looked at the security of these devices, which shocked me,” said Christina Boucher, Ph.D., a professor of computer and and engineering at UF, expert in bioinformatics, and co-author of the new report.

Boucher collaborated with Sara Rampazzi, Ph.D., also a professor of computer and information science and engineering, cybersecurity expert and project lead at UF, and students in the department to test Nanopore sequencers for . The study serves as a warning to the scientific community that new threats to genomic data urge a shift toward “secure-by-design” systems as portable DNA sequencers become increasingly common. The team published their findings in Nature Communications.

The researchers uncovered three vulnerabilities in the Oxford Nanopore MinION portable sequencer and its associated software. Two of these flaws allow an unauthorized user to improperly access the device and potentially copy or alter the DNA data without the authorized user’s knowledge. A third flaw opens the sequencer to a denial-of-service attack, which would halt the sequencing operation and make the device appear broken.

The Cybersecurity and Infrastructure Security Agency, the federal government’s cyber defense coordinator, verified these vulnerabilities in a report released Oct. 21. The report also provides instructions from Oxford Nanopore Technologies on how users can update their sequencers to address the security flaws.

Versions with older software would remain open to attack. This is especially possible when the portable sequencers are connected to insecure Wi-Fi networks or remote control is activated.

Costing just a few thousand dollars and able to operate anywhere in the world, these palm-sized sequencers have transformed the previously cumbersome and expensive work of sequencing DNA. But that portability contributes to the of these devices because the sequencers must be connected to a computer to work.

“You are connecting a very specialized device to a general-purpose device like a laptop, which is intrinsically assumed to be secure,” said Rampazzi. “Instead, that laptop could be connected to an unsecured network, or it could be infected with malware or ransomware, especially if used in the field outside controlled environments.”

These nanopore sequencers are marketed only for research use and not to be used for clinical diagnosis. Yet even when restricted to research, these devices can be used to sequence the DNA of people.

The U.S. National Institute of Standards and Technology, which focuses on defining genomic cybersecurity and privacy guidelines, has only started to consider research use cases in distinction to clinical use in their latest draft guidelines, highlighting the increased attention on the topic and the lack of a clear standard.

Revealing these previously undiscovered vulnerabilities was only possible due to the interdisciplinary collaboration between the Rampazzi and Boucher labs. Boucher develops algorithms to better analyze DNA, while Rampazzi researches security flaws in ranging from , and self-driving cars to underwater data centers. Combining their expertise helped alert the community to a significant privacy threat.

“In bioinformatics, we haven’t been working as closely with the security community as I think we should be,” Boucher said.

More information:
Toward security-aware portable sequencing, Nature Communications (2025). DOI: 10.1038/s41467-025-66024-z

Citation:
Security flaws in portable genetic sequencers risk leaking private DNA data (2025, November 10)
retrieved 10 November 2025
from https://techxplore.com/news/2025-11-flaws-portable-genetic-sequencers-leaking.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





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In a Rut? Here Are the Best Sexy Gifts to Get You (and Your Partner) Revved Up

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In a Rut? Here Are the Best Sexy Gifts to Get You (and Your Partner) Revved Up


Others Tested

Photograph: Molly Higgins

Aurelia Lingerie Subscription Box Starting at $85 (Monthly): A monthly lingerie subscription box is sure to keep things spicy. This small, Canadian-based lingerie retailer has human-curated lingerie subscription boxes and size-inclusive lingerie (they carry bra sizes A-M and panties XS-4XL). When beginning the lingerie subscription service, you fill out a style quiz that asks you a series of questions about style preferences and a human stylist creates a unique box for you or your lover. The box also comes with a guide on how to measure your cup size, with troubleshooting tips, a measuring tape, and a zippered net case for washing the delicates.

Underclub Subscription Box Starting at $85 (Underwear): With Underclub, you can give both a practical and sexy gift to your lover every month. Subscribers can choose between a bralette set with a matching top and bottom or two pairs of underwear bottoms delivered each month. When you sign up, you’ll be asked a series of questions about your personal preferences and a stylist will curate an underwear box for you. The bra sizes range from XS to 2XL, 30 to 42 inches in band size, and A-DD.

Magic Wand Mini for $76: This lil guy is iconic for a reason. The handheld vibrating wand provides powerful stimulation over a large surface area. It gets around three hours of battery life, not that your giftee will be using it for that long in one go (maybe!). The Mini is easier to hold and use compared to the original, larger Magic Wand, and its buttons are convenient to reach. Eric Ravenscraft

Lelo Sona 2 Cruise for $114: We once called this “the Cadillac of suction toys” in our Best Clitoral Suction Toys guide. It’s small and discreet, and can be as gentle or as intense as you like. It has an elegant, curvy body with chrome accents that make it stylish enough to look good on your nightstand. The “Cruise” part of the name refers to Lelo’s Cruise Control technology, which makes the toy ramp up intensity when you press it hard against your body. Eric Ravenscraft

Lovense Gravity for $144: Vibrators can provide a lot of fulfilling stimulation, but one thing most of them lack is thrust. This vibrator from Lovense straddles the line between vibrator and sex machine (which is why it earns a spot in our Best Sex Machines guide), with a motor for automated thrust as well as vibration. It comes with a suction-cup mount, and it can also be controlled through the company’s robust mobile app for easier remote control or to customize thrust and vibration patterns. Eric Ravenscraft

Dame Pom Flexible Vibrator for $95: A mainstay in our Best Vibrators guide, the Dame Pom Flexible Vibrator is a little powerful handheld vibe that’s also gorgeous and intuitively designed. It has the power you’d expect from a bullet vibe, but the added silicone body diffuses the vibrations through a broad area for a unique experience. Not only is it easy to hold and operate one-handed, but it also fits neatly in the palm of most hands. All the buttons are right where your fingers land naturally. Eric Ravenscraft

MysteryVibe Crescendo 2 for $230: This flexible, bendable vibrator has six separate motors, all of which can be customized and controlled from its included app. But what sets it apart is its semi-rigid jointed body. You can straighten it out to use for more direct penetration, or curl it up, similar to how one might bend their fingers. It won’t lock into position so some resistance can bend it right back, but it’s handy for hitting some of those more hard-to-reach spots on and in your body. Eric Ravenscraft

Lelo Personal Moisturizer Water-Based Lube for $12: This water-based lube tops our Best Lubes guide. It’s a bit pricier per ounce than others, but it’s worth it. Many lubes get sticky or thick pretty quickly, but Lelo’s manages to stay fluid and smooth throughout playtime. It’s also paraben- and glycerine-free, which is great for people with skin sensitivities. Eric Ravenscraft

Lelo Hex Condoms for $23: We’ve tested a bunch of condoms, and the Lelo Hex was our top pick. The same company that makes some of our favorite sex toys also makes very sturdy condoms. They have a stylish hexagonal pattern that Lelo claims makes the condoms sturdier, and they didn’t break as easily as others in our tests. It’s also one of the most comfortable condoms I’ve worn, with the hexagon pattern helping to add a bit of grip to prevent slippage. Eric Ravenscraft


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