Hacker News: jdyer9

New comment by jdyer9 in "I bought Friendster for $30k – Here's what I'm doing with it"

jdyer9 — Mon, 27 Apr 2026 05:49:15 +0000

My thoughts as well, I love this!

Easy to do, easy to implement but hard to bypass. Also it tells me something about the network that is not vying for a slice of the attention economy and isn't going to do everything it can to keep me on the site.

New comment by jdyer9 in "Show HN: Red Grid Link – peer-to-peer team tracking over Bluetooth, no servers"

jdyer9 — Sat, 21 Mar 2026 06:36:05 +0000

This comment got me thinking that it might be worth using their second-to-last location to try and derive some vector. Obviously that's super informative as you already know the edge of the map they left, but maybe it's useful?

New comment by jdyer9 in "xAI joins SpaceX"

jdyer9 — Tue, 03 Feb 2026 07:48:38 +0000

It's a good question, but in a closed system (like you have in space) the heat from the turbine loop has to go somewhere in order to make it useful. Let's say you have a coolant loop for the gpus (maybe glycol). You take the hot glycol, run it through your heat exchanger and heat up your cool, pressurized ammonia. The ammonia gets hot (and now the glycol is cool, send it back). You then take the ammonia and send it through the turbine and it evaporates as it expands and loses pressure to spin the turbine. But now what? You have warm, vaporized, low pressure ammonia, and now you need to cool it down to start over. Once it's cool you can pressurize it again so you can heat it up to use again, but you have to cool it, and that's the crux of the issue.

The problem is essentially that everything you do releases waste heat, so you either reject it, or everything continues to heat up until something breaks. Developing useful work from that heat only helps if it helps reject it, but it's more efficient to reject it immediately.

A better, more direct way to think about this might be to look at the Seebeck effect. If you have a giant radiator, you could put a Peltier module between it and you GPU cooling loop and generate a little electricity, but that would necessarily also create some waste heat, so you're better off cooling the GPU directly.

New comment by jdyer9 in "Battery storage hits $65/MWh, a tipping point for solar"

jdyer9 — Sat, 13 Dec 2025 06:16:29 +0000

So, in doing a bit of research from a link in one of the other comments, this is lcos, levelized cost of storage. I understand that to be roughly equivalent to the marginal cost of using it, including the capex divided over the unit volume. That same article uses $125/kwh as the capex, which is in line with your (and my) expectations of the cost to install.

$65/mwh works out to $0.065/kwh, so that makes sense. Effectively you can read this as "it costs $65/mwh to store and then consume electricity using these batteries"

New comment by jdyer9 in "Nano Banana Pro"

jdyer9 — Sat, 22 Nov 2025 19:26:12 +0000

Oh man, I've been playing with GCP's vertex AI endpoints, and this is so representative of my experience. It's actually bananas how difficult it is, even compared to other GCP endpoints

New comment by jdyer9 in "Amazon’s Ring to partner with Flock"

jdyer9 — Sat, 18 Oct 2025 04:08:53 +0000

If it matters to you, Reolink is a Chinese owned company. Not passing judgement one way or another, but if avoiding Unifi over the remote incident matters, I could see this factoring in as well.

New comment by jdyer9 in "Ask HN: Who is hiring? (August 2025)"

jdyer9 — Fri, 01 Aug 2025 15:05:31 +0000

Kharon | Individual Contributor and Data Engineering Leadership Opportunities | REMOTE or HYBRID in London, Madrid and Denver | Full Time - https://kharon.com/careers

Kharon is on a mission to revolutionize the current global security landscape. When you look at any major global crisis event, we’re providing intelligence that’s at the heart of those circumstances. We connect the dots in a way that’s meaningful, and we're currently growing our Data Engineering vertical. Operating at the intersection of global security + international commerce Engineering team tackling massive open-source data at scale Stack: Python (Pandas, NumPy, FastAPI), SQL, Spark, Databricks, Neo4j, Elasticsearch, AWS, Docker, K8s Feel free to check out open roles at the link above.

New comment by jdyer9 in "Ask HN: Who is hiring? (July 2025)"

jdyer9 — Wed, 02 Jul 2025 21:23:20 +0000

Kharon | Individual Contributor and Data Engineering Leadership Opportunities | HYBRID in London or Madrid or On-site in Denver, CO | Full Time

Apply here: https://kharon.com/careers

New comment by jdyer9 in "My five-year experiment with UTC"

jdyer9 — Sun, 01 Jun 2025 04:29:50 +0000

This is exactly the system I would have designed!

New comment by jdyer9 in "An end to all this prostate trouble?"

jdyer9 — Sun, 27 Apr 2025 16:40:19 +0000

Nitpicking on the mechanic point, but this is pretty common, just not at the same level of detail as medicine. Certain brands, models, and parts are more likely to fail in certain ways, so if a model comes in with symptoms of a known, high frequency problem, many times that work will be done first rather than taking more of the car apart to inspect individual parts.

Certainly I didn't think there's huge bodies of work on those statistics the same way there is for medicine, but any car repair forum online will give you some sense of this

New comment by jdyer9 in "North Korean IT workers have infiltrated the Fortune 500"

jdyer9 — Tue, 08 Apr 2025 04:32:03 +0000

Imagine that your reputation didn't matter, getting sued was out of the question, and there was no criminal liability: your job, backed by the government, is to be employed by as many tech firms for as long as you can, you'd probably work pretty hard on coming up with a reasonable but very good resume and work hard on how to interview well. Now, you're a professional interviewer and might conduct 10x-100x more interviews than your average dev, and have a network of people helping you optimize your cheating.

Given that background, I personally find it unsurprising that they're having success and AI tools are just making it that much easier

New comment by jdyer9 in "The Pyrex Glass Controversy That Just Won't Die (2019)"

jdyer9 — Fri, 28 Mar 2025 15:48:30 +0000

For what it's worth, the article says the exact opposite

  Protip: Look for all-caps PYREX graphics which can either indicate that is vintage or that it’s from Europe, where a company called Arc International owns the Pyrex brand and still makes its cookware out of borosilicate.

New comment by jdyer9 in "Waymos crash less than human drivers"

jdyer9 — Thu, 27 Mar 2025 05:50:11 +0000

It's likely often repeated because if you try driving 55 in a 55mph zone where people are driving between 62-70, it'sterrifying, it feels like you're stopped. Whether the stat is true or not remains to be seen, but intuitively, it makes a lot of sense. Sure, your risk of rear ending someone at that point is probably negligible, but the odds of being rear ended? Hard to say

New comment by jdyer9 in "LeetCode but You Can Force People to Code in Light Mode"

jdyer9 — Mon, 24 Feb 2025 02:04:13 +0000

I always struggled with loving dark mode, but I usually keep my brightness as low as tolerable without straining, and your comment made me wonder if it's related I do like dark mode if I'm working in a super dark room though

New comment by jdyer9 in "BioTerrorism Will Save Your Life with the 4 Thieves Vinegar Collective [video]"

jdyer9 — Sun, 29 Dec 2024 23:17:30 +0000

I'd argue it's about customisation, not as much about the process. A couple can't be made anywhere other than a factory, but we're seeing this exact thing happen more and more with custom chip design. Sure not hand made, but skewing towards custom. Previously, there were a handful of CPU's and that was it, but then GPUs came along, and now Tensor, Graviton, etc all with more specialized purpose. Maybe it won't be too long before people start building fabs in their basement, but I doubt it.

Also, custom PCB's are getting easier and easier, it seems like there's a ton of YouTube videos sponsored by and about doing custom PCB's for projects in 2024. Heck, I have an Air gradient in my house, and while it's not a custom CPU, it is a custom, relatively low volume PCB designed by (as far as I can tell) a single person, almost like an artist...

I'm not trying to add a lot to the conversation, just suggest that even chips are moving towards customisation and artisanship.

New comment by jdyer9 in "How to Cure Acid Reflux with Simple Exercise: An Anecdotal Study"

jdyer9 — Sat, 28 Dec 2024 06:21:03 +0000

As for how to do it, based on my reading, imagine a mattress on the floor. And then, to follow your comparison, imagine a prayer, particularly an Islamic prayer pose (knees on the floor, hips in the air, head and hands touching the floor). Except as the author describes it, your knees would be up on the mattress, and your head and hands would touch the floor, rendering your torso largely inverted.

Also, I realize that there's a lot more to the Adhan than just this pose, but it's the only easily searchable thing I can think of at the moment.

New comment by jdyer9 in "YubiKey still selling old stock with vulnerable firmware"

jdyer9 — Wed, 13 Nov 2024 06:31:06 +0000

As another commenter started to point out, the risk is essentially cloning the key. So, if you were out to dinner and it was cloned while you were out, you might not realize you'd been compromised whereas if it was stolen, it might too late, but you'd know. It seems that for many/most people the risk is low, but anyone at risk of a state sponsored attack should be aware.

For the threat model of keeping out random online attackers with no physical access, it seems this vulnerability doesn't matter.

New comment by jdyer9 in "Ask HN: Life-changing purchases since 2020? (Under $100 and under $1000)"

jdyer9 — Thu, 07 Nov 2024 23:34:51 +0000

Same, I don't even like washing my hands with cold tap water, but cold bidet water is no issue.

New comment by jdyer9 in "FTC announces "click-to-cancel" rule making it easier to cancel subscriptions"

jdyer9 — Thu, 17 Oct 2024 00:57:37 +0000

Except Walgreens. They say unsubscribe and then they just don't do it.

New comment by jdyer9 in "Timeshare owner? The Mexican drug cartels want you"

jdyer9 — Thu, 26 Sep 2024 04:51:29 +0000

Presumably the difference with a condo is that the condo owner has a fair vote in the buildings management (usually an HOA in the US) and enough votes can be used to destroy the building if it achieves high enough liability-to-value ratio. That does not exist for a timeshare, the timeshare owners can never band together to change the governance of the building