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mutagen

1,442 karma · joined September 16, 2011

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mutagen··on First Successful Test of General Relativity Near Supermassive Black Hole
Ahhh so simple! Thank you very much for the moment of enlightenment.
mutagen··on First Successful Test of General Relativity Near Supermassive Black Hole
Anyone know why the black hole is marked well off the axis of the orbit of S2 in diagram [1]? Is there enough mass elsewhere at the center of the galaxy to have it orbiting a common mass so far off axis? The video of the orbit [2] seems to show it closer to the axis or the focus I'd expect but still seemingly a bit of an offset. The fulldome view video [3] does show that there is quite a bit of stuff moving around there so maybe my imaginations are wrong, I think of a black hole having so much mass that it completely dominates the local gravitational field.

1. https://www.eso.org/public/unitedkingdom/images/eso1825c/

2. https://www.eso.org/public/unitedkingdom/videos/eso1825g/

3. https://www.eso.org/public/unitedkingdom/videos/eso1825g/

mutagen··on El Fuego Viviente Chili Sauce
Habanero and mustard makes a great base flavor for hot sauces. My introduction was via Aji Chombo hot sauce from Panama. The addition of sweet and fruitiness and the cumin and curry sounds amazing.
mutagen··on Ask HN: What’s your “Everyone has a price” experience?
It is, but I think it is a useful discussion of our own personal ethics to have. Take a moment to reflect on some of the scenarios and how you would react to them. Do your principles and your belief system speak to the issues raised?

It is also timely, in that Google and Microsoft are considering or have had to consider their ethics company-wide. Current political events also ask what the United States is willing to accept as a nation.

mutagen··on Announcing Flutter Release Preview 1
Have you looked at Uno?

http://platform.uno/

C# & XAML UWP layer with Xamarin for mobile. The company behind it has been using for a few years to produce apps and recently open sourced it. I'm intrigued and weighing it against Flutter for my next bit of mobile experimentations.

mutagen··on Accelerated Computing Powering World’s Fastest Supercomputer
Several years ago I had the opportunity to attend a non-classified project coordination conference / catchup meeting with some DoE scientists, among them attendees from LLNL and Los Alamos. I overheard discussion and some bragging about the number of cycles they had their simulation kernels at. At least some of them are dedicated to extracting every last bit of performance out of their code.
mutagen··on USDZ File Format Specification [pdf]
Some interesting technical decisions in the file format, USDZ is a zip file with no compression or encryption for zero copy / mmap the file from heap. 64 byte alignment for AVX512. Consideration given to file ordering for streaming and LOD.
mutagen··on The iPhone dongle is still my fucking nightmare
Do you or anyone here have suggestions on the happy versions of the standards and protocols that result in 'can't really tell a difference'? I tried a few years ago and my middle aged 14 kHz roll-off happy with v0 VBR mp3 ears could tell a difference, I finally understood what people were talking about with listening fatigue and the like. Now admittedly it's been a few a few years and my car isn't likely to be able to negotiate a happy protocol but I'd love to get a reasonably priced stereo bluetooth headset that sounded OK.
mutagen··on What's in those mysterious cabinets?
Want to rabbit-hole deep on traffic engineering? There’s a long-running thread on the Something Awful forums about traffic engineering:

https://forums.somethingawful.com/showthread.php?threadid=31...

Traffic controls, intersection design, role playing regional transportation planning, and much much more.

mutagen··on Ask HN: How to self-learn electronics?
Fantastic recommendations! This hits my favorites out of my wife's cooking viewing and they've both entertained and improved our cooking and the enjoyment of creating memorable dishes.
mutagen··on All disk galaxies rotate once every billion years: study
The mass of the central black hole is a tiny fraction of the mass of the galaxy, it might be more correct to say that the objects in a galaxy orbit the common mass (including dark matter) of the galaxy.

For example, the black hole at the center of the Milky way is estimated at 4.1×10^6 M (solar mass) and the total Milky Way mass is estimated at 0.8–1.5×10^12 M (figures from Wikipedia).

Some interesting articles found while digging for these numbers:

https://ned.ipac.caltech.edu/level5/Merritt/Merritt1.html

https://academic.oup.com/mnras/article/420/4/3621/975383

https://academic.oup.com/mnras/article/414/3/2446/1042117

mutagen··on All disk galaxies rotate once every billion years: study
They're not all aligned on the same plane, they're somewhat aligned along the matter filaments and sheets (including the suspected dark matter) that make up the large scale structure of the universe.

"Galaxies are not distributed randomly in the cosmic web but are instead arranged in filaments and sheets surrounding cosmic voids. [...snip...] We found evidence that the spin axes of bright spiral galaxies have a weak tendency to be aligned parallel to filaments. For elliptical/S0 galaxies, we have a statistically significant result that their spin axes are aligned preferentially perpendicular to the host filaments;..."

https://arxiv.org/pdf/1207.0068.pdf

"Galaxy shapes are not randomly oriented, rather they are statistically aligned in a way that can depend on formation environment, history and galaxy type."

https://arxiv.org/pdf/1504.05465.pdf

https://ned.ipac.caltech.edu/level5/March15/Joachimi/Joachim...

mutagen··on WebAssembly architecture for Go
What kind of WASM file sizes can we expect? I know some work has gone into shrinking Go executables, especially in 1.7, but will we be able to produce something like the 15KB Rust Hello World WASMs? Go has a fantastic stdlib but it hasn’t prioritized web optimized file sizes (yet).

I’m looking forward to the results of this work!

mutagen··on Wing Commander II
Ahh, memories of playing this after work on our owner’s 386 because it ran so much more buttery smooth than on my 286 EGA computer. Calling the ATI BBS in Canada to download updated drivers after hours so the call was cheaper and hopefully Wing Commander ran or ran better.
mutagen··on “Study Death Always”: Seneca’s advice for living centered on dying
Thank you for this service.

My friend's step-father recently passed away. He was a Vietnam era veteran and didn't leave this world with much planning for his passing. The service provided by the volunteers was of huge comfort to my friend and his family, the simple yet meaningful service lent dignity to the end of a situation that didn't have much of it.

mutagen··on A Company That Tears Cars Apart to Find Out How They're Built
With more and more functionality moving into software, is Munro or anyone else doing anything along these lines with the firmware and software in vehicles? Are manufacturers as interested in evaluating the process and design of their software as they are with the physical pieces of the vehicle? Do copyright and sometimes murky legalities around reverse engineering software prevent the equivalent teardown (disassembly) and analysis of software components?

Despite being known for kaizen processes implemented as Plan -> Do -> Check -> Act or 5 Whys, Toyota's issues with unintended acceleration were partly blamed on flaws and spaghetti code in the RTOS controlling their Electronic Throttle Control System in some models:

https://users.ece.cmu.edu/~koopman/pubs/koopman14_toyota_ua_... http://www.safetyresearch.net/blog/articles/toyota-unintende...

That's just one example. There's the CAN bus car hacking via OnStar and more examples out there. Would this kind of analysis help more than say, simply implementing better software development methodologies?

mutagen··on Where Pot Entrepreneurs Go When the Banks Say No
I'm curious about the timing of publishing this on the day that AG Sessions announces a return to previous DoJ practices in prosecuting violations of Federal marijuana law, specifically mentioning money laundering and money transmitting statutes. It can't be coincidence, can it? Am I missing something or does this paint a nice big bulls-eye for the feds on Safe Harbor Private Banking?
mutagen··on Meltdown and Spectre: Bugs in modern computers leak passwords and sensitive data
A typewriter is likely even more susceptible than a computer keyboard to a listening attack:

https://freedom-to-tinker.com/2005/09/09/acoustic-snooping-t...

Has anyone applied similar methods to pen on paper?

mutagen··on Implementing Malloc: Students and Systems Programming [pdf]
>Because we are running on 64-bit machines, your allocator must be coded accordingly, with one exception: the size of the heap will never be greater than or equal to 232 bytes. This does not imply anything about the location of the heap, but there is a neat optimization that can be done using this information. However, be very, very careful if you decide to take advantage of this fact. There are certain invalid optimizations that will pass all the driver checks because of the limited range of functionality we can check in a reasonable amount of time, so we will be manually looking over your code for these violations.

I’m curious about these optimizations and the issues that arise, any pointers on more reading?

mutagen··on A method for improving Milky Way exposures in light pollution
Some quick digging found
mutagen··on Jessamyn West, Technology Lady (2015)
Great interview, I enjoyed your insights into separating out the emotional issues from the technology issues and the challenges that UX / UI issues present.
mutagen··on Ethereum from scratch – Part 1: Ping
Signed up and got 500 server error :(
mutagen··on Build your own FPGA (2012)
With tongue firmly in cheek, I wonder how long before it becomes cost effective to mine Bitcoin with raw 74xx logic?
mutagen··on Why Is the TSA Scanning Paper?
Agreed. IMO the other plausible theory is disguising a bladed weapon of some kind in stacks of paper. The rest of the speculation appears to be based on misinterpretations of the headlines (scanning vs X-ray).
mutagen··on The flexi disc audio format
I remember the whale songs from the National Geographic when I was a kid! I was incredibly intrigued, especially with the sped up versions that sounded like birds.
mutagen··on Guetzli: A New Open-Source JPEG Encoder
My impression was that a fractured landscape of patents and some encoding performance issues doomed fractal image compression. Add rapidly expanding bandwidth and the need for better image compression dried up. DCT and related techniques were good enough to make it a tough market to enter and compete with. I could be way off base though.
mutagen··on How 1,600 People Went Missing from U.S. Public Lands
If you enjoyed this article, there's a rather deep rabbit-hole documenting the search for a German family that went missing in Death Valley about 20 years ago.

http://www.otherhand.org/home-page/search-and-rescue/the-hun...

mutagen··on The probability of data loss in large clusters
Has Backblaze done any digging through their data for hard disk failure correlations among manufacturers? I know some manufacturers show higher rates than others but within same model have they seen spikes of failures at around the same age, # of reads/writes, etc?

Are there any other large public hard drive failure datasets that could contribute to refining the type of analysis in this article?

mutagen··on Deepest X-ray Image Ever Reveals Black Hole Treasure Trove
The post (http://chandra.harvard.edu/photo/2017/cdfs/) on the Chandra site has some additional information, including links to a couple of papers:

The deepest X-ray view of high-redshift galaxies: constraints on low-rate black-hole accretion (https://arxiv.org/pdf/1608.02614v1.pdf)

and THE CHANDRA DEEP FIELD-SOUTH SURVEY: 7 MS SOURCE CATALOGS (https://arxiv.org/pdf/1611.03501v2.pdf) which has some nice images overlaying X-ray sources on images closer to visual wavelengths.

mutagen··on Nectar: A Native JavaScript Compiler Inspired by Crystal Lang and Nim Lang
Fantastic, and the description of cross compilation in the blog post intrigues me. Looking forward to checking this out.
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