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Gli ultimi otto messaggi ricevuti dalla Federazione
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Is the Theory of Special Relativity Wrong?
There’s an adage coined by [Ian Betteridge] that any headline ending in a question mark can be answered by the word “No”. However, Lorentz invariance – the theory that the same rules of physics apply in the same way in all frames of reference, and an essential component of special relativity – has been questioned for some time by researchers trying to unify general relativity and quantum field theory into a theory of quantum gravity. Many theories of quantum gravity break Lorentz invariance by giving photons with different energy levels very slightly different speeds of light – a prediction which now looks less likely since researchers recently analyzed gamma ray data from pulsed astronomical sources, and found no evidence of speed variation (open-access paper).
The researchers specifically looked for the invariance violations predicted by the Standard-Model Extension (SME), an effective field theory that unifies special relativity with the Standard Model. The variations in light speed which it predicts are too small to measure directly, so instead, the researchers analyzed gamma ray flare data collected from pulsars, active galactic nuclei, and gamma-ray bursts (only sources that emitted gamma rays in simultaneous pulses could be used). Over such great distances as these photons had traveled, even slight differences in speed between photons with different energy levels should have added up to a detectable delay between photons, but none was found.
This work doesn’t disprove the SME, but it does place stricter bounds on the Lorentz invariance violations it allows, about one and a half orders of magnitude stricter than those previously found. This study also provides a method for new experimental data to be more easily integrated into the SME. Fair warning to anyone reading the paper: the authors call their work “straightforward,” from which we can only conclude that the word takes on a new meaning after a few years studying mathematics.
If you want to catch up on relativity and Lorentz invariance, check out this quick refresher, or this somewhat mind-bending explanation. For an amateur, it’s easier to prove general relativity than special relativity.
Top image: Crab Pulsar, one of the gamma ray sources analysed. (Credit: J. Hester et al., NASA/HST/ASU/J)
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Brescia: giornata di azioni antisfratto promosse da “diritti per tutti”
@anarchia
Lotta per la casa. Giornata di mobilitazione contro gli sfratti il 15 gennaio 2026 con attiviste e attivisti dell’Associazione Diritti per tutti di Brescia impegnati in tre azioni https://www.rivoluzioneanarchica.it/brescia-giornata-di-azioni-antisfratto-promosse-da-diritti-per-tutti/
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Hey, all! Thank you very much for the responses. I'm one year or more. We started a program a few years ago, partly to engage our kids in cooking. They had a lot of fun, and the food was healthy and tasty. But we all kind of drifted away from it, and when the company wanted a bigger commitment, we just cancelled the program.
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@mattiagiovanetti ottimo motivo.
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Qualche idea per sopravvivere al divorzio transatlantico. Conversazione con Giuliano Da Empoli
“quelli che chiamo predatori digitali e predatori politici, i proprietari delle grandi aziende digitali, sostengono esplicitamente i movimenti nazionalisti, perché si sono resi conto di poterli sfruttare per smantellare le democrazie liberali: su quello che viene dopo, sul futuro, non c’è convergenza, ma intanto si distrugge insieme, e con più efficacia”
https://foglioeuropeo.ilfoglio.it/qualche-idea-per-sopravvivere-al-divorzio-transatlantico/
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Project Fail: Cracking a Laptop BIOS Password Using AI
Whenever you buy used computers there is a risk that they come with unpleasant surprises that are not of the insect variant. From Apple hardware that is iCloud-locked with the original owner MIA to PCs that have BIOS passwords, some of these are more severe than others. In the case of BIOS passwords, these tend to be more of an annoyance that’s easily fixed by clearing the CMOS memory, but this isn’t always the case as [Casey Bralla] found with a former student-issued HP ProBook laptop purchased off Facebook Marketplace.
Maybe it’s because HP figured that locking down access to the BIOS is essential on systems that find their way into the hands of bored and enterprising students, but these laptops write the encrypted password and associated settings to a separate Flash memory. Although a master key purportedly exists, HP’s policy here is to replace the system board. Further, while there are some recovery options that do not involve reflashing this Flash memory, they require answers to recovery questions.
This led [Casey] to try brute-force cracking, starting with a Rust-based project on GitHub that promised much but failed to even build. Undeterred, he tasked the Claude AI to write a Python script to do the brute-forcing via the Windows-based HP BIOS utility. The chatbot was also asked to generate multiple lists of unique passwords to try that might be candidates based on some human guesses.
Six months later of near-continuous attempts at nine seconds per try, this method failed to produce a hit, but at least the laptop can still be used, just without BIOS access. This may require [Casey] to work up the courage to do some hardware hacking and erase that pesky UEFI BIOS administrator password, proving at least that apparently it’s fairly good BIOS security.
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Allora... Per 3, 5 e 9 sono preparato...
Purtroppo invece su 1, 2, 4, 6, 7 e 8 mi devo applicare decisamente di più! 😂
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I absolutely understand many, many people do not like AI generated videos. I don't like them either.
However, do not get threatening and sanctimonious and dog pile on someone who has posted something in good faith, clearly didn't know it was AI, and doesn't have the skills to spot it.
Because people become terrified of posting anything for fear of it being AI and getting lambasted for it.
AI is DESIGNED to fool people. And when you beat up someone who is fooled, you're beating up a victim.
