Companies with investors are evil Updated 2025-07-16
They may have nice looking save the world charity campaigns, but once you get even close to affecting their revenue stream, the axe falls. The charity is only a publicity stunt to reduce wages.
Some level of government intervention is needed to control investor's greed.
It is just a question of business model: some business models are eviler than others. Making people pay for operating systems being possible the most evil of all.
One thing must be said however. You can learn a lot by working in a good company, because it ends up putting you in contact with practical real problems that you wouldn't otherwise see by just doing your own random low-tech startup. This is especially valuable if said company is also enlightened enough to use and contribute back to open source software, thus improving the world and paying back the moral debt of using other people's work for free.
Another important point to consider is who in the company is evil. In a sane tech company, the lowly engineers are going to be non-evil. And then the more you go up the management chain, the more aligned you have to be with investors, and thus the more and more evil you get. HR is just evil from the bottom though, it's just the nature of their job.
Crow Updated 2025-07-16
Culture of Japan Updated 2025-07-16
Compile MicroPython code for Micro Bit locally Updated 2025-07-27
To use a prebuilt firmware, you can just use What that does is:
uflash, tested on Ubuntu 22.04:git clone https://github.com/bbcmicrobit/micropython
cd micropython
git checkout 7fc33d13b31a915cbe90dc5d515c6337b5fa1660
uflash examples/led_dance.py- convert the MicroPython code to bytecode
- join it up with a prebuilt firmware that ships with uflash which contains the MicroPython interpreter
- flashes that
To build your own firmware see: Compile MicroPython code for Micro Bit locally on Ubuntu 22.04 with your own firmware
Computer science bibliography Updated 2025-07-16
Hund's second rule Updated 2025-07-16
x86 Paging Tutorial Linux source tree Updated 2025-07-16
In
v4.2, look under arch/x86/:include/asm/pgtable*include/asm/page*mm/pgtable*mm/page*
There seems to be no structs defined to represent the pages, only macros:
include/asm/page_types.h is specially interesting. Excerpt:#define _PAGE_BIT_PRESENT 0 /* is present */
#define _PAGE_BIT_RW 1 /* writeable */
#define _PAGE_BIT_USER 2 /* userspace addressable */
#define _PAGE_BIT_PWT 3 /* page write through */ Complete metric space Updated 2025-07-16
In plain English: the space has no visible holes. If you start walking less and less on each step, you always converge to something that also falls in the space.
One notable example where completeness matters: Lebesgue integral of is complete but Riemann isn't.
Connected space Updated 2025-07-16
Jewish Christian Updated 2025-07-16
Kaggle Updated 2025-07-16
To be fair, this is one of the least worse ones.
Radiocarbon dating Updated 2025-07-16
Robotics Updated 2025-07-16
Causality in quantum mechanics Updated 2025-07-16
In simple terms, if you believe in the Schrödinger equation and its modern probabilistic interpretation as described in the Schrödinger picture, then at first it seem that there is no strict causality to the outcome of experiments.
People have then tried to recover that by assuming that there is some inner sate beyond the Schrödinger equation, but these ideas are refuted by Bell test experiments, unless we give up the principle of locality, which feels more important, especially in special relativity, where faster-than-light implies time travel, which breaks causality even more dramatically.
Celestron NexStar 4SE Updated 2025-07-16
CIA 2010 covert communication websites Updated 2025-07-26
This article is about covert agent communication channel websites used by the CIA in many countries from the mid 2000s until the early 2010s, when they were uncovered by counter intelligence of some of the targeted countries, notably Iran and China, circa 2010-2013.
This article uses publicly available information to publicly disclose for the first time a few hundred of what we feel are extremely likely candidate sites of the network. The starting point for this research was the September 2022 Reuters article "America’s Throwaway Spies" which for the first time gave nine example websites, and their analyst from Citizenlabs claims to have found 885 websites in total, but did not publicly disclose them. Starting from only the nine disclosed websites, we were then able to find a few hundred websites that share so many similarities with them, i.e. a common fingerprint, that we believe makes them beyond reasonable doubt part of the same network.
If you enjoy this article, consider dropping some Monero at: 4A1KK4uyLQX7EBgN7uFgUeGt6PPksi91e87xobNq7bT2j4V6LqZHKnkGJTUuCC7TjDNnKpxDd8b9DeNBpSxim8wpSczQvzf so I can waste it on my foolish attempts to improve higher education. Other sponsorship methods: Section "Sponsor Ciro Santilli's work on OurBigBook.com".
The discovery of these websites by Iranian and Chinese counterintelligence led to the imprisonment and execution of several assets in those countries, and subsequent shutdown of the channel by the CIA when they noticed that things had gone wrong. This is likely a Wikipedia page that talks about the disastrous outcome of the websites being found out: 2010–2012 killing of CIA sources in China, although it contained no mention of websites before Ciro Santilli edited it in.
Of particular interest is that based on their language and content, certain of the websites seem to have targeted other democracies such as Germany, France, Spain and Brazil.
If anyone can find others websites, or has better techniques feel free to contact Ciro Santilli at: Section "How to contact Ciro Santilli". Contributions will be clearly attributed if desired. Some of the techniques used so far have been very heuristic, and that added to the limited amount of data makes it almost certain that some websites have been missed. Broadly speaking, there are two types of contributions that would be possible:The fact that citizenlabs reported exactly 885 websites being found makes it feel like they might have found find a better fingerprint which we have not managed to find yet. We have not yet had to pay for our data. If someone wants to donate to the research, some ideas include:
* dump $400 on WhoisXMLAPI to dump whois history of all known hits and search for other matches. Small discoveries were made like this in the past and we'd expect a few more to be left. We don't expect huge breakthroughs from this, but at only $400 it is not so bad
* dump a lot more ($15k+? needs confirmation as opaque pricing) on DomainTools. We are not certain that they have any superior data since there is no free trial of any kind, but it would be interesting to test the quality of the data they acquired from Farsight DNSDB if you are really loaded
- finding new IP ranges: harder and more exiting, and potentially requires more intelligence
- better IP to domain name databases to fill in known gaps in existing IP ranges
* dump $400 on WhoisXMLAPI to dump whois history of all known hits and search for other matches. Small discoveries were made like this in the past and we'd expect a few more to be left. We don't expect huge breakthroughs from this, but at only $400 it is not so bad
* dump a lot more ($15k+? needs confirmation as opaque pricing) on DomainTools. We are not certain that they have any superior data since there is no free trial of any kind, but it would be interesting to test the quality of the data they acquired from Farsight DNSDB if you are really loaded
Disclaimers:
- the network fell in 2013, followed by fully public disclosures in 2018 and 2022, so we believe that the benefit of giving the public this broader historic understanding outweighs the risks that agents could be found so many years later by sloppy secret services
- Ciro Santilli's political bias is strongly pro-democracy and anti-dictatorship, but with a good pinch of skepticism about the morality US foreign policy in the last century
Amateur telescope Updated 2025-07-16
Complex dot product Updated 2025-07-16
This section is about the definition of the dot product over , which extends the definition of the dot product over .
Some motivation is discussed at: math.stackexchange.com/questions/2459814/what-is-the-dot-product-of-complex-vectors/4300169#4300169
Just like the usual dot product, this will be a positive definite symmetric bilinear form by definition.
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