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Over 80% of sunscreen performed below their labelled efficacy (2020)

news.ycombinator.com Unknown 2025-10-08 01:57:59

The use of effective sunscreen can reduce the harm caused to the skin by ultraviolet rays (UV) and slow down skin aging. The Consumer Council tested 30 models of sunscreen for daily use and over 80% of them were found to perform below their respective labelled efficacy. The measured sunscreen efficacy of 4 models were below SPF15, of which 2 were sunscreen products with very high protection i.e. labelled with SPF50+. Among the 23 models using the “PA System” which is commonly adopted by Asian co

Topics: measured models protection skin spf

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Are we decentralized yet?

news.ycombinator.com Robert Ricci 2025-10-19 14:26:29

This page measures the concentration of user data on the Fediverse and the Atmosphere according to the Herfindahl–Hirschman Index (HHI), an indicator from economics used to measure competition between firms in an industry. Mathematically, HHI is the sum of the squares of market shares of all servers. Values close to zero indicate perfectly competitive markets (eg. many servers, with users spread evenly), while values close to 10000 indicate highly concentrated monopolies (eg. most users on a si

Topics: concentrated data measures servers users

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Sixteen bottles of wine riddle

news.ycombinator.com Chris K. W. 2025-10-31 01:57:50

Imagine the typical everyday scenario in which you have been imprisoned in the wine cellar of an evil combinatorialist. She promises to let you go, but only if you can solve her riddle. “Is it the one where there are 1000 barrels of wine and one of them is poisoned?” “Uh, maybe? Do you already know the answer to that one?” “…” You’re lead past a conspicuous amount of barrels and into a new room where you’re given a bottle of wine and four measuring devices. The combinatorialist explains that t

Topics: bottle device measurements w_ wine

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Sixteen Bottles of Wine Riddle

news.ycombinator.com Chris K. W. 2025-10-31 16:57:50

Imagine the typical everyday scenario in which you have been imprisoned in the wine cellar of an evil combinatorialist. She promises to let you go, but only if you can solve her riddle. “Is it the one where there are 1000 barrels of wine and one of them is poisoned?” “Uh, maybe? Do you already know the answer to that one?” “…” You’re lead past a conspicuous amount of barrels and into a new room where you’re given a bottle of wine and four measuring devices. The combinatorialist explains that t

Topics: bottle device measurements w_ wine

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As a linguist, I want to find the words to measure chronic illness

news.ycombinator.com M Corvi 2025-12-04 09:16:40

Heather Hogan / The Sick Times Let me paint a scene that is all too familiar: I’m not feeling well (again), I go to the doctor (again), they take some blood (again; I turn my head away) and poke at me in whatever way my insurance company deems appropriate. The result is a long sheet of seemingly arbitrary numbers that indicate something about my metabolic processes and the resulting sensations, and I leave without much information aside from some variation of: “These tests tell me that your bo

Topics: like long measure pain sensations

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Foldable phones are thin and light in 2025, so why are these brands bending the truth?

androidauthority.com Unknown 2026-01-06 12:00:19

Paul Jones / Android Authority TL;DR A Twitter user has shown that the Galaxy Z Fold 7 is thinner than the HONOR Magic V5. It turns out both HONOR and OPPO measure their foldables without the protective inner screen film. A closer look at product pages also reveals that some brands don’t include these layers when weighing their foldables. HONOR launched the Magic V5 in China earlier this month, and the company claimed that the white version was the world’s thinnest foldable phone at 8.8mm. H

Topics: foldable honor inner measurement phone

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New quantum paradox clarifies where our views of reality go wrong (2018)

news.ycombinator.com Anil Ananthaswamy 2026-02-01 23:43:16

That quantum mechanics is a successful theory is not in dispute. It makes astonishingly accurate predictions about the nature of the world at microscopic scales. What has been in dispute for nearly a century is just what it’s telling us about what exists, what is real. There are myriad interpretations that offer their own take on the question, each requiring us to buy into certain as-yet-unverified claims — hence assumptions — about the nature of reality. Now, a new thought experiment is confro

Topics: alice experiment friend measurement quantum

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New Quantum Paradox Clarifies Where Our Views of Reality Go Wrong

news.ycombinator.com Anil Ananthaswamy 2026-02-02 05:43:16

That quantum mechanics is a successful theory is not in dispute. It makes astonishingly accurate predictions about the nature of the world at microscopic scales. What has been in dispute for nearly a century is just what it’s telling us about what exists, what is real. There are myriad interpretations that offer their own take on the question, each requiring us to buy into certain as-yet-unverified claims — hence assumptions — about the nature of reality. Now, a new thought experiment is confro

Topics: alice experiment friend measurement quantum

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The EU Proposes New Rules to Govern the European Space Race

wired.com Fernanda González 2026-02-05 00:00:00

There are around 11,000 satellites orbiting Earth, and it is estimated that at least 50,000 more will be launched in the next decade. There are also exploration instruments, resupply vessels, and complexes like the International Space Station. But who regulates all this activity in space? In the absence of clear regulations, the European Union has proposed the Space Act, a set of measures that seeks to make the European space sector a cleaner, safer, and more competitive environment, both domest

Topics: commission european measures orbit space

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The axion may help clean up the messy business of dark matter

arstechnica.com Unknown 2026-02-24 06:00:47

In recent years, a curious hypothetical particle called the axion, invented to address challenging problems with the strong nuclear force, has emerged as a leading candidate to explain dark matter. Although the potential for axions to explain dark matter has been around for decades, cosmologists have only recently begun to seriously search for them. Not only might they be able to resolve some issues with older hypotheses about dark matter, but they also offer a dizzying array of promising avenue

Topics: dark emitting matter measure methods

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9 Best Smart Shades, Blinds, and Curtains (2025), Tested and Reviewed

wired.com Simon Hill 2026-03-09 05:30:00

Tailor-Made vs. Off-the-Shelf: Few things look smarter than perfectly fitted shades in a window frame, and few things look worse than shades that don’t quite fit. If you’re lucky enough to have window sizes that match the exact proportions of off-the-shelf shades then go for it, but most folks will be better served by going the made-to-order route. The downside is that tailor-made options are always going to be more expensive. Measure Properly: Look at your chosen manufacturer’s website to find

Topics: look measure shade shades smart

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Can You Trust the Data in a Privacy-First World?

computer.org Enrique Quezada 2026-03-14 01:15:17

Online advertising powers much of the internet economy, but collecting user data across platforms raises significant privacy concerns. Researchers from TikTok Inc., Duke University, and Penn State University have developed a solution that balances measurement accuracy with privacy protection. In their paper “Click Without Compromise: Online Advertising Measurement via Per User Differential Privacy,” Yingtai Xiao, Jian Du, Shikun Zhang, Wanrong Zhang, Qian Yang, Danfeng Zhang, and Daniel Kifer i

Topics: advertising data measurement privacy user

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