6,311 karma · joined February 24, 2008
To check, see this 5-line brute-force calculation in JavaScript: https://news.ycombinator.com/item?id=42024474
const counts = Array(7).fill(0);
for (let year = 2000; year < 2400; year++) {
counts[new Date(year, 0, 1).getDay()]++;
}
console.log(`Number of Saturdays: ${counts[6]}; Number of Sundays: ${counts[0]}`);
Number of Saturdays: 56; Number of Sundays: 58
Do you recall the solution? It seems like a tricky problem. No approach occurs to me aside from a brute force analysis of the 400 year Gregorian calendar cycle, accounting for the complete leap year rules (under which, e.g., 1900 was not a leap year but 2000 was).
Even if it doesn't make any different concrete predictions, a new way of thinking about things can attract scientists' attention. The Many Worlds interpetation of QM is an example.
> For all spy cameras.. raw image.. encoding and compression.. takes place in an inbuilt read-write memory whose operations cause electromagnetic radiation (EMR).. Whenever the visual scene changes, bursts of video data processing.. aggravate the memory workload, bringing responsive EMR patterns. ESauron can detect spy cameras by intentionally stimulating scene changes and then sensing the surge of EMRs.. Experiments with 50 camera products show that ESauron can detect all spy cameras with an accuracy of 100% after only 4 stimuli, the detection range can exceed 20 meters even in the presence of blockages, and all spy cameras can be accurately located.
130° would cook a steak to medium rare.
You sure?
“He was born in the summer of his 22nd year…”
What's unclear or not transparent about that?
I found the bio of the author, Jo Marchant, on Amazon (https://www.amazon.com/stores/author/B00B9DBJ3E/about):
> [Marchant] has a PhD in genetics and medical microbiology from St Bartholomew’s Hospital Medical College in London, and an MSc in Science Communication from Imperial College London. She previously worked as a senior editor at New Scientist and at Nature, and her articles have appeared in publications including The New York Times, The Washington Post, The Guardian and Smithsonian magazine.
That said, my very uneducated guess is that the problem being solved here is not important for many users of distributed consensus algorithms. If you have a bunch of nodes that need to agree on something, you generally don't mind sharing a cryptographic secret among them as part of the set-up.
https://en.wiktionary.org/wiki/network : “To get a job in today's economy, it is important to have a strong network.”
> As a term, "British Isles" is a geographical name and not a political unit.
As context for anyone unfamiliar with the issue, below are some quotes from a 2008 SciAm article discussing a research paper by Fayed et al titled "Evidence of brain damage after high-altitude climbing by means of magnetic resonance imaging" (https://pubmed.ncbi.nlm.nih.gov/16443427/).
https://www.scientificamerican.com/article/brain-cells-into-... (emphasis added):
> … one of the sobering things about the Fayed study is that even when climbers showed no signs of acute sickness, the scans still found brain damage.
> The results in the Everest climbers were the starkest… The expedition had no major mishaps, and none of the 12 professional climbers evinced any obvious signs of high-altitude illness; the only acute case of mountain sickness was a mild one in the expedition’s amateur climber. Yet only one of the 13 climbers (a professional) returned with a normal brain scan. All the scans of the other 12 showed cortical atrophy or enlargement of the Virchow-Robin (VR) spaces. These spaces surround the blood vessels that drain brain fluid and communicate with the lymph system; widening of these VR spaces is seen in the elderly but rarely in the young.
> The body is remarkably resilient: Does the brain recover from these mountaineering wounds? To answer this question, the researchers reexamined the same climbers three years after the expedition, with no other high-altitude climbing intervening. In all cases, the damage was still apparent on the second set of scans.
2015 population of Canada south of Seattle (~47.6°N): ~22 million (https://imgur.com/a/azeTbwz)
2015 Canada population: ~35 million
Sources:
- NASA SEDAC Population Estimator (https://sedac.ciesin.columbia.edu/mapping/popest/gpw-v4/)
- Statistics Canada (https://www150.statcan.gc.ca/n1/daily-quotidien/150929/dq150...)
> For several years [Sam] was running both YC and OpenAI, but when OpenAI announced that it was going to have a for-profit subsidiary and that Sam was going to be the CEO, we (specifically Jessica) told him that if he was going to work full-time on OpenAI, we should find someone else to run YC, and he agreed. If he'd said that he was going to find someone else to be CEO of OpenAI so that he could focus 100% on YC, we'd have been fine with that too. We didn't want him to leave, just to choose one or the other.
It's interesting that YC had to raise the issue, rather than Sam saying to YC, "Hey, I've found this other thing I want to do full-time, can we start looking for my replacement?"
I think Matuschak wants to be able to recall particular things ~forever, and spaced repetition is the best method known for that.
(Nit: Your sentence begins as a genuine expression of puzzlement rather than an outright criticism, but then you refer to Matuschak's "obsession", which pre-judges the issue. It would be more consistent to refer to his "emphasis on" or "advocacy of".)
Matuschak writes:
> In my personal practice, I've accumulated thousands and thousands of questions.
> I spend about ten minutes a day using my memory system. Because these exponential schedules are very efficient, those ten minutes are enough to maintain my memory for thousands of questions, and to allow me to add up to about forty new questions each day.
It takes a while to formulate (and subsequently edit) a single good question (https://www.supermemo.com/en/blog/twenty-rules-of-formulatin...), but suppose we leave that aside and assume that by "using my memory system", Matuschak means answering previously-formulated questions. He says that questions should take only a few seconds each, so suppose it takes 10 seconds on average to answer a question. Then one could answer 40 questions in 400 seconds, which is under 7 minutes. That leaves 3 minutes to review roughly 20 questions of older material.