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Place-Based Programming

generally referred to as persistent memoization.

maybe persistent futures in this case, since you've got these intermediate "place" values.

Preventing overcharging by prosecutors

If upfront assessments are provided, I expect the defense bar would gleefully keep track of such things.

They already informally track the behavior of the DA's offices they deal with. They're extremely organized in some areas and in near-constant communication with one another.

Covid 4/1: Vaccine Passports

If a person receives a static, permanent QR code, then some QRs will leak (or be deliberately leaked) and will be used en masse. And some QRs will be given out to friends and family.

...who cares? The QR code contains a cryptographically signed attestion that "DanArmak" is vaccinated. Not "whoever displays this code is vaccinated". You only need a program for decoding it, and verifying the signature against the signing keys from states.

Photocopying them would be only slightly more useful than photocopying somebody else's drivers license. Sure, if they've got the same name or look just like you, they can use it, but if I photocopy my drivers license and put it online, there's not a lot of people who could reasonably pass as me.

With permanent codes, the application presenting the QR can't prove it's the genuine application, so people could just as easily show an image.

You absolutely do not need anything to display it, you could print it out on paper. The genuine-ness comes from the cryptographic signature.

Saying that such an un-trustworthy system

It's extremely trustworthy, but unfortunately the mechanism of trust isn't clear until you understand public key cryptography.

Including photos in the QR is possible; a B&W photo would fit. If you want to include more data, you can put a copy of the photo online

The whole point of the suggestion was a scheme which was not traceable. That means not fetching people's pictures.

QR bandwidth is surprisingly high.

I understand how QR codes work just fine, but being on a piece of paper in somebody's wallet, we've got to turn the ECC up to max, and I've also got an estimate for the size of the rest of the data that needs to go in there in order to make it useful.

The mechanism doesn't need to be perfect, it'll just mostly work, and this one also perfectly preserves privacy. (It can also be tweaked and tuned in a variety of ways which I'm not going to take the effort to explain to a non-software engineer.)

Covid 4/1: Vaccine Passports

the QR code can just have a cryptographically signed attestation from a government agency that the person has been vaccinated. that can be verified by an app which does not need to communicate with a central authority. if the authority released the corresponding public keys, open source apps could do the job. and the vaccination doesn't expire, so the code doesn't need to. (but perhaps you could include some vaccine lot number info if you're super excited about such things, so apps could know about bad batches? that's probably not worth the effort to discuss.)

the hard part is figuring out who to attest has been vaccinated, and what information you can cram into the attestation which will satisfy people viewing the QR code. (an entire photo wouldn't fit.)

How can I protect my bank account from large, surprise withdrawals?

To further detail the exact amount of effort: I get paid once a month, so once I month I go in, look at what I've got, subtract off my estimate for everything else, leave a few hundred dollars of slush, and come up with some excess amount. I then go over the brokerage site and issue the transfer for that excess. At the same time, I review the state of the brokerage account. I think it's pretty minor, and it gets my cash over to the brokerage firm where it can sit in a money market account. That pays a pittance these days, but it has been a significantly larger pittance than anything my bank would offer me for the last 15 years.

(And then you've got access to a variety of bond funds, so you can easily transfer the cash into a fund which matches your exactly risk tolerance. Or otherwise invest it. All useful things to be doing, which your bank does not usually facilitate.)

How can I protect my bank account from large, surprise withdrawals?

I'd be surprised if exactly what you want is possible.

To accomplish a similar effect, I keep the bulk of my assets with a large, reputable brokerage firm, and just leave the most recent paycheck's worth with the local bank. I can transfer to/from the bank and brokerage firm, and every other organization (employer, power company, credit cards, etc) only gets to know about the bank account. That limits the amount transfers can get ahold of. I suspect, but am not sure, that the brokerage firm doesn't even accept outside requests for transfers. I think all transfers in/out of them have to be initiated on their end.

AI Winter Is Coming - How to profit from it?

Certainly NVDA will drop briefly if there's a widely publicized AI winter, even if it doesn't actually affect their bottom line. Probably the safest way to profit (as in, the downside is bounded, as opposed to shorting, where the downside is unbounded), then, is to identify companies that will experience short term drops because of publicity, without actually being harmed, and buy the dip(s).

Wireless is a trap

Security and privacy seem like useful footnotes here, too. The security situation with standard wireless protocols has improved to "acceptable" in recent years, but right as soon as you get some one-off link (between your mouse and the proprietary dongle?) then nobody knows how bad the situation is. You're just trusting the manufacturer to have accomplished a feat that piles of smart people screw up on a regular basis.

The YouTube Revolution in Knowledge Transfer

I'm with Viliam, as regards the MOOCs. If we looked at statistics about how many people go from searching for javelin throwing videos on Youtube to successfully throwing a javelin without injuring themselves or others, the percentage is probably quite low. We'd see MOOCs doing better if we looked at whatever subset of the population who click the "start" button cared fractionally as much about the material as those who jump through the process of applying to a university, paying piles of money, and waiting until the start of a semester to begin learning.

Percent reduction of gun-related deaths by color of gun.

The US government could nearly implement this by mandating that military firearms be pink. That's perfectly within its purview. That's were the trend setting comes from. Not action movies, where many of the firearms are non-existent bodged together things, or where they're used in hilariously wrong ways.

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