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jjcob

586 karma · joined January 7, 2025

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jjcob··on Exercise intensity is associated with cardiometabolic health
Yeah, it doesn't actually work for "real" sprinting. Standard treadmills take too long to get up to speed.

But if you do 30-60s work intervals treadmills work just fine.

jjcob··on Exercise intensity is associated with cardiometabolic health
In my experience HIIT works very well on a treadmill. Many treadmills even have presets for HIIT.
jjcob··on AirPods 5
Volume swipe! If that's what I think it is (controlling volume by swiping finger over Airpods) then that alone is worth the upgrade!
jjcob··on Apple Watch Series 12
I wonder if this feature will make people wary of Apple watch wearers.
jjcob··on Apple Watch Series 12
Looks like Apple Watch Series 12 still doesn't have dual frequency GPS. Makes it a hard sell for someone who wants to use it as a running watch.
jjcob··on Three sites made 215,128 “best software” pages for AI. Perplexity cites them
you have to go a level deeper, and plant the most basic version of the thought, just a seed, so that it grows and they think it's their own idea
jjcob··on Polymarket has flooded social media with deceptive videos by paid creators
an unhealthy diet will literally wipe out your life.
jjcob··on Polymarket has flooded social media with deceptive videos by paid creators
The burger ad is also getting people addicted and destroying lives. But with burgers most people blame the victims. In my opinion it's all the same. Gambling, junk food, drugs, guns... Lots of money to be made, lots of lives destroyed.
jjcob··on Ask HN: What are you working on? (June 2026)
Still doesn't work for me. Maybe it's line endings or something. I'm on Safari on macOS.
jjcob··on Ask HN: What are you working on? (June 2026)
Even with the stats it doesn't work. Maybe hacker news comments don't preserve whitespace or something.
jjcob··on Ask HN: What are you working on? (June 2026)
I tried to verify your text and your website says "DOES NOT MATCH THIS RECEIPT"
jjcob··on They Live (1988) inspired Adblocker
"Mainstream" people will also look at past evidence that A, B and C did Y, and say something like "that was N years ago, surely nobody would do this today".
jjcob··on OpenClaw isn't fooling me. I remember MS-DOS
Even if you assume the cost of lodging was 1000€ (which it isn't) then the au-pair would still be significantly underpaid.

A normal full time employee costs at least 2000€ a month (salary, tax, pension plan, health insurance, etc). If you are paying less than that you are definietly exploiting them.

jjcob··on Car Seats as Contraception
giving each of our kids their own room reduced our families stress level significantly. it's not 100% necessary, but i really don't think that making kids share a room helps them get along better....
jjcob··on AI uBlock Blacklist
If a blocklist doesn't get updated it is outdated in a week.

Some tools are useful without updates. A blocklist for AI content farms that are sprouting like crazy is not helpful if it isn't updated.

jjcob··on Children with cancer scammed out of millions fundraised for their treatment
I've worked with an organisation that was on the receiving end of a popular charity, and they definitely got something (new playground equipment for disabled children). Can't say how efficient the charity was, but there are definitely charities that don't keep all the money for themselves.
jjcob··on Children with cancer scammed out of millions fundraised for their treatment
I'm still waiting for the tech world to wake up and realise that the online ad machinery and user tracking software that the brightest minds of our generation have been working on are just a way to efficiently connect scammers with their unsuspecting victims.
jjcob··on Children with cancer scammed out of millions fundraised for their treatment
Pretty impressive work. I always wondered what all those correspondents do that news organisations employ all over the world. I guess that's one of those things.
jjcob··on Meta shuts down global accounts linked to abortion advice and queer content
Corporations aren't people, but in the end it's still people that are responsible for this crackdown on liberal content. It's someone at Facebook making these decisions, someone who is a person, we just don't know who the responsible person is.
jjcob··on Australia begins enforcing world-first teen social media ban
> fringe networks that are off the radar and will take them to very dark places very quickly

Soo... we already have a problem with some youths running into extremist content on Facebook, TikTok, Telegram ... no "fringe" network needed.

jjcob··on Show HN: Gemini Pro 3 imagines the HN front page 10 years from now
The jokes are not new. If you read Philip K Dick or Douglas Adams there's a lot of satirical predictions of the future that sound quite similar. What's amazing about LLMs is how they manage to almost instantly draw from the distilled human knowledge and come up with something that fits the prompt so well...
jjcob··on Google unkills JPEG XL?
I think it means encoded in such a way that you first have low res version, then higher res versions, then even higher res versions etc.
jjcob··on How do you manage user feedback and early adopter input?
> Where do you collect feedback?

Using every possible channel. Feedback button in the app, email, Github issues, ... I make it as easy as possible for people to tell me what they want.

> How do you prioritize it?

When multiple people independently request the same thing I start working on it.

> Do you use public roadmaps or keep everything internal?

I think public roadmaps are stupid because I never know how much effort something is ahead of time. It often happens that I realise after starting a project that it is way harder than I thought. I also often realise after some time has passed that something I thought was useful is actually not necessary and I remove it from the roadmap. I don't want people to buy my product expecting feature X and then I strike it.

jjcob··on Airbus A320 Fly by wire corrupted by radiation in flight
Can you expand on that? Do you have any knowledge about those parts except their part numbers?
jjcob··on 210 IQ Is Not Enough
My son started walking at 8.5 months. He's got a 3.5 month head start on those 12 month walking late bloomers. I have very high expectations. I wonder where his walking skills are going to take him one day, but this comment worries me because he has so far not shown any interest in the Korean alphabet.
jjcob··on Rebecca Heineman has died
And performed by researchers that received free education in their home country before moving to the US because they hope for a better career there...
jjcob··on GPT-5.1: A smarter, more conversational ChatGPT
Might be a result of using LLMs to evaluate the output of other LLMs.

LLMs probably get higher scores if they explicitly state that they are following instructions...

jjcob··on Marble Fountain
You are missing inertia!

The state of each ball can be described by 9 parameters: the current location of the center of mass (x,y,z), the current linear velocity (vx, vy, xz) and the angular velocity on 3 axes.

I don't think the forces acting on the rails need to be similar -- they just need to be such that the acceleration of the ball is always parallel to the track. Unfortunately the equation of motion will look pretty ugly and optimizing the system will be quite a challenge.

And finally, the system has to be stable, ie. small perturbations should be cancelled rather than grow - if a ball gets a little too fast there should be something like a bend that slows it down, but that bend should at the same time not slow down a ball that is already too slow...

jjcob··on Visa and Mastercard near deal with merchants that would change rewards landscape
> Is everything 3% cheaper in the eu?

No, because in Europe sales tax is higher and included in the displayed price, so stuff is generally more expensive. But obviously everything is 3% cheaper than it would be if businesses still had to pay 3% fees. (credit card fees used to be really high before EU regulation came in -- the minimum fee was so high that merchants sometimes paid more in fees than they made in profit when a customer swiped a credit card instead of a debit card).

But the much bigger advantage is that reward cards aren't a thing, and credit card usage is much less common. Most people just use their debit cards. Credit card debt is much less of a problem because credit cards aren't advertised like they are in the US. People spend less if they don't always have $3000 of credit available.

jjcob··on Visa and Mastercard near deal with merchants that would change rewards landscape
Credit card rewards are not good for consumers. Low fees are good for consumers.
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