DavidSJ

36 ms·

361.
by DavidSJ 6y ago
In a sense, yes. For a given temperature, hydrogen, with 1 atomic mass unit, will have a much higher velocity than water (18 amu, so √18 ≈ 4.2 times as slow) or carbon dioxide (44 amu, so √44 ≈ 6.6 times as slow).
362.
by DavidSJ 6y ago
One clarification: thrust-to-weight says something about an engine’s mass (by definition), but specific impulse only says something about the exhaust velocity of the propellant (i.e. the impulse per unit of mass), not the mass of the engine
363.
by DavidSJ 6y ago
No, what Gelman says is that he suspects that to compensate for the fat tails in 538's state distributions, they had to reduce the between-state correlations, to get a desired overall level of uncertainty. This implies that correlation
364.
by DavidSJ 6y ago
Other way around: uncorrelated errors tend to cancel each other, correlated errors tend to reinforce each other.
365.
by DavidSJ 6y ago
apropos-documentation (C-h d) and apropos-command (C-h a) provide some such functionality. You could also try searching for "apropos" with apropos-command to find other related commands.
366.
by DavidSJ 6y ago
If you don’t care, don’t add it to your deck. What’s that you say? You downloaded premade decks? Don’t do that! Constructing your deck yourself is an important part of the learning process.
367.
by DavidSJ 6y ago
You’re right, I didn’t read the context carefully enough.
368.
by DavidSJ 6y ago
Not generally, but there shouldn’t be government microphones preemptively planted in everyone’s home, Stasi style, just waiting for a warrant either. It’s one thing to have the ability to wiretap selectively and with some cost which makes i
369.
by DavidSJ 6y ago
I think you’re being sarcastic but I’m actually not sure.
370.
by DavidSJ 6y ago
This is reminiscent of my experience designing SQL queries to be run on large MySQL databases. I had to write my queries in such a way that I was basically specifying the execution plan, even though in theory SQL is practically pure set the
371.
by DavidSJ 6y ago
My dictionary defines political as "relating to the government or the public affairs of a country". Given that genocide is the policy of the Chinese government, it's a political matter.
372.
by DavidSJ 6y ago
Economic sanctions would be good, if they were conditioned on China's treatment of Uyghurs. But they're not. Right now, to the extent that they're conditioned on anything at all (and I'm going to refrain from a broader
373.
by DavidSJ 6y ago
I'm referring specifically to the Uyghur situation. Trump may have done all sorts of things China doesn't like, and I'm not interested in getting into a general political debate about the merits of each of those things, but h
374.
by DavidSJ 6y ago
One possibility is that some economic pressure can be brought to bear by a Biden administration, perhaps in concert with other Western countries. Edited to add: This statement is political, but the genocide against Uyghurs is political too,
375.
by DavidSJ 6y ago
One plausible explanation: school is as bad for teens' mental health as quarantine, so going from one to the other has been a wash.
376.
by DavidSJ 6y ago
I'm okay with killing half a million big fish to end this pandemic.
377.
by DavidSJ 6y ago
And so it is: https://www.youtube.com/watch?v=7ne0GArfeMs
378.
by DavidSJ 6y ago
It's true that media and file formats weren't as standardized in the late 20th century, but nowadays, so much of our world is stored in the cloud, or on devices we own yet barely control, and subject to the mercurial whims and bus
379.
by DavidSJ 6y ago
Everything else aside, the term makes sense. It’s not the reverse of racism. It’s racism in the reverse direction than the more “traditional” one.
380.
by DavidSJ 6y ago
The problem is not with the Login keychain, but the Local Items keychain.
381.
by DavidSJ 6y ago
I’ll add: the default behavior should be the right thing for most users, assuming it won’t be disastrous for a significant minority of other users. The right thing for most users is to have an encrypted backup of the keychain that’s part of
382.
by DavidSJ 6y ago
Why don’t my Time Machine backups count as something I have? Why should that only be the behavior for the Local Items keychain and not also the Login keychain? From the user’s perspective, what’s the meaningful difference between the two?
383.
by DavidSJ 6y ago
Some more information on this issue: https://forums.macrumors.com/threads/data-migration-local-ke... https://apple.stackexchange.com/questions/142123/extract-pas... https://apple.s
384.
by DavidSJ 6y ago
I've made a top-level post at https://news.ycombinator.com/item?id=24626562 (edit: and tweeted it at https://twitter.com/TheDavidSJ/status/1310912175934902272 ).
385.
Tell HN: macOS keychains cannot always be restored from backups
14 points by DavidSJ 6y ago|5 comments
386.
by DavidSJ 6y ago
It's not acceptable. I don't understand how it's not widely known, nor how it's gone seven years without a fix. I wouldn't go so far as to say Time Machine/Time Capsule is useless, but it does have this severe
387.
by DavidSJ 6y ago
As a public service announcement, I recently discovered that, since OS X 10.9 Mavericks (released 2013), Time Machine's backup of keychains is completely broken for anyone who does not use iCloud Keychain. This bug is actually so compl
388.
by DavidSJ 6y ago
And another (posted by yours truly): https://news.ycombinator.com/item?id=23758188
389.
by DavidSJ 6y ago
At a web startup I worked at years ago, I spent all night tracking down a nasty bug related to user signups. I eventually traced it to one specific line of original founder code, and lo and behold, on that line was the comment: "this i
390.
by DavidSJ 6y ago
On the other hand, the best of our inventions and discoveries seem to have been just barely within our grasp, and it took modern Homo sapiens 200 thousand years to reach this level of domination of the planet. A slightly less intelligent sp

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