rockfishroll (u/rockfishroll)

rockfishroll commented on Control shopping cart wheels with your phone (2021) begaydocrime.com/... · Posted by u/mystraline

SoftTalker · 3 days ago

Aldi in the USA uses a coin system on their carts, you insert a quarter to unlock the chain. It's not so much about theft, if someone wanted a cart, a quarter is a cheap price to pay. They do it so that people bring the carts back to the corral at the front of the store to get their quarter back, instead of leaving them in the parking area. That way, the store doesn't need to hire someone to go out and gather the carts every 15 minutes.

In my view it's quite an inconvenience: who carries quarters around anymore? I rarely have any cash with me, let alone loose change.

I expect we'll soon see something where you make a small payment with your card or mobile pay app which is rebated when you return the cart.

rockfishroll · 3 days ago

I think this solution also misses the fact that certain kinds of people (like bored kids) will walk through fire for a free quarter. It's not even the money, it's the novelty. So if you have a population of people who consider the charge 'the cost of shopping' and don't care enough about 25 cents to return the cart, you still have a whole other population of people who will hunt them down and return them for those people.

As a kid, I almost missed a flight while hunting luggage carts at the airport.

rockfishroll commented on Japanese scientists develop artificial blood compatible with all blood types tokyoweekender.com/entert... · Posted by u/Geekette

rockfishroll · 3 months ago

Biopure was a company doing something similar in the US. They imploded in the early 2000s, but they had created an "oxygen therapeutic" (blood substitute) by isolating hemoglobin based oxygen carrying molecules FROM COW BLOOD!

The fact that they weren't using whole red blood cells meant the product was typeless, room temp stable, and better at perfusing around arterial blockages and into tissue since the molecules were so small.

Unfortunately, the company was kind of a mess. They managed to get licensed for sale in South Africa, and in the US for the veterinary product, but never managed FDA approval. It's a shame. Everyone could see the promise of the product, and it really actually worked, but they just couldn't seem to make the business viable.

https://en.wikipedia.org/wiki/Biopure

Edit: When I say they imploded, I really mean it. They got prosecuted for misleading statements to investors about the state of US clinical trials, and the legal proceedings became farcical.

"On March 11, 2009 [Senior VP] Howard Richman pleaded guilty in U.S. District Court and admitted he had instructed his lawyers to tell a judge he was gravely ill with colon cancer. He also admitted to posing as his doctor in a phone call with his lawyer so that she would tell the judge that his cancer had spread and that he was undergoing chemotherapy."

That guys was sentenced to 3 years in prison. Here's hoping this new blood substitute has a happier outcome!

rockfishroll · 3 months ago

One more anecdote. WADA, the World Anti Doping Agency, had to specifically address using hemoglobin based blood substitutes for doping.

https://www.wada-ama.org/en/resources/scientific-research/de...

This class of products is room temperatures stable, and typeless, and it increases oxygen carrying capacity basically immediately. You can imagine how useful that would be for something like a Tour De France team. Keep a half dozen units of fake blood in your team bus. No special equipment. No rigorous temp control. You can give any unit to any one of your athletes without worrying about compatibility. You can administer it on race day, eliminating any chance of being caught in the runup to your event.

Obviously Biopure condemned off-label use of their product for blood doping, but behind closed doors they were super proud that it was seen as effective enough to be called out by name by WADA. No publicity is bad publicity and all that.

rockfishroll commented on Japanese scientists develop artificial blood compatible with all blood types tokyoweekender.com/entert... · Posted by u/Geekette

energywut · 3 months ago

Interesting to see. There's been some other efforts in this space, from blood products derived to chemically derived (e.g. perflurocarbons, which carry many multiples of what hemoglobin can carry, oxygen-wise).

There's definitely a need for a safe, shelf stable blood substitute.

Though, I'd argue that this isn't artificial blood, it's artificially replacing only the oxygen carrying role of blood -- there's nothing in this product that is producing clotting, fighting disease, managing hormones, fueling cells, etc. Still, excited to see this progress, transfusions are still a risky bet, and having something that can provide at least the O2 capacity in a safer package is very welcome.

rockfishroll · 3 months ago

You can see my top-level comment for more context, but I've seen other products in this space called "oxygen therapeutics" for exactly this reason. They're not really blood, they're an oxygen delivery system. It seemed like a pedantic distinction when I first heard the term, but I think you make some good points about why the distinction is meaningful.

rockfishroll commented on Japanese scientists develop artificial blood compatible with all blood types tokyoweekender.com/entert... · Posted by u/Geekette

rockfishroll · 3 months ago

Biopure was a company doing something similar in the US. They imploded in the early 2000s, but they had created an "oxygen therapeutic" (blood substitute) by isolating hemoglobin based oxygen carrying molecules FROM COW BLOOD!

The fact that they weren't using whole red blood cells meant the product was typeless, room temp stable, and better at perfusing around arterial blockages and into tissue since the molecules were so small.

Unfortunately, the company was kind of a mess. They managed to get licensed for sale in South Africa, and in the US for the veterinary product, but never managed FDA approval. It's a shame. Everyone could see the promise of the product, and it really actually worked, but they just couldn't seem to make the business viable.

https://en.wikipedia.org/wiki/Biopure

Edit: When I say they imploded, I really mean it. They got prosecuted for misleading statements to investors about the state of US clinical trials, and the legal proceedings became farcical.

"On March 11, 2009 [Senior VP] Howard Richman pleaded guilty in U.S. District Court and admitted he had instructed his lawyers to tell a judge he was gravely ill with colon cancer. He also admitted to posing as his doctor in a phone call with his lawyer so that she would tell the judge that his cancer had spread and that he was undergoing chemotherapy."

That guys was sentenced to 3 years in prison. Here's hoping this new blood substitute has a happier outcome!

rockfishroll commented on Show HN: SQL Noir – Learn SQL by solving crimes sqlnoir.com... · Posted by u/chrisBHappy

rockfishroll · 6 months ago

I solved all of them. Minor nitpick: Since every criminal confesses to their crime, the fastest way to solve most of these is to query the confessions table for strings like '%i did%' or '%kill%'.

rockfishroll commented on How Gothic architecture became spooky architecturaldigest.com/s... · Posted by u/teleforce

amiga386 · 10 months ago

I don't think Gothic architecture ever drove the plots of Gothic romance or horror, apart from a few choice novels. It was mostly used as a setting.

The spookiness, at least for Americans, came like so:

1. Gilded Age upper classes built the fanciest mansions they could afford, in the Neo-Gothic style which was fashionable at the time

2. Like the English country houses (see https://en.wikipedia.org/wiki/Destruction_of_country_houses_...), eventually these rich owners couldn't afford the upkeep of these massively oversized and ornate dwellings. And nobody would buy them. So they moved out and left the mansions to become ruins

3. Now lots of people know about the old abandoned mansion on the hill. Gothic! Spooky! That includes Charles Addams, who starts making jolly cartoons in the New Yorker about the odd family that live in a big spooky mansion, and it includes Alfred Hitchcock who thinks a run-down mansion is a great setting for Psycho

rockfishroll · 10 months ago

You see a similar trend again with "abandoned mental hospitals" as settings for horror in TV and movies. The trend of "deinstitutionalization" started in the 50s and 60s, meant that by the 80s and 90s many psychiatric hospitals had been defunded and shut down. As a result, it was a surprisingly common childhood experience for people of a certain age to have an "old abandoned mental hospital two towns over". Every kid "knew someone who knew someone with an older brother who had spent all night in one", and there were a ton of them around to use as settings.

Maybe in 30 years, all horror movies will be set in abandoned cup cake stores.

rockfishroll commented on A Real Life Off-by-One Error leejo.github.io/2024/09/0... · Posted by u/leejo

AEVL · a year ago

Not an off-by-one error—at least not in spirit. Interesting nonetheless.

I expected the article to eventually answer this puzzle:

> The competition started and got through a number of rounds. There were some comments about how the climber on the left always won.

Near the end:

> The kicker is that the out of place hold hasn’t been used in a long time. The climbers have optimised their route such that it is skipped. The same happens to the fourth hold from the bottom. So either being in the wrong place is immaterial to the climbers’ technique as long as they don’t get in the way.

So it seems like the error discovered by the article author should not have conferred any advantage to the climber on the left.

Anyone who can shine light on this matter?

rockfishroll · a year ago

It's true that modern competitive speed climbers don't use that hold. The collective optimization of the route is hilariously serious (it's an olympic sport after all) and the different optimizations have names, like 'The Tomoa Skip'.

But I think it's possible that 'extra' holds are potentially like 'junk' DNA. People fall into the trap of thinking that DNA is useless if it's never transcribed, but we know that's not actually the case. Non-expressed DNA can do things like alter binding affinity for neighboring sequences, affecting how often those neighboring sequences are expressed. I think it's possible that climbers are taking in a lot of information subconsciously as they sprint through this route in order to mike very small adjustments. The position of surrounding holds, even ones they never touch, could very well be a part of that information stream. They're fighting over hundredths of a second, so even a very small effect could be meaningful.

rockfishroll commented on Show HN: AI climbing coach – visualize how to climb any route based on your body climbing.ai/... · Posted by u/smandava

petsfed · a year ago

Outside of a short-lived usurper on instagram selling pet food dishes, I am still the only petsfed on the internet, since 1997.

What's really wild to me is how somebody would recognize a mid-tier poster from a website I thought effectively defunct for nearly 10 years now.

rockfishroll · a year ago

It just goes to show how impactful online communities are capable of being. rockclimbing.com was in it's heyday right as I was discovering climbing. I was a bored kid constructing my entire identity around climbing and there was no other place to do that outside of the gym. No mountain project. No youtube. No social media. I spent a lot of hours lurking those forums. There are only a handful of users I could still name, but I bet I would recognize a lot of them.

rockfishroll commented on Show HN: AI climbing coach – visualize how to climb any route based on your body climbing.ai/... · Posted by u/smandava

petsfed · a year ago

Well, the tricky bit here is that the route setter, a human, is the one actually solving the problem. So the problem as set is (and must be) a human creation first. This is especially true in outdoor climbing, where the first ascent process might involve the installation of anchor fixtures, or the removal of poorly-secured features for safety. You'd need some pretty wild sensor suites to correctly differentiate between a really good hold, and a dangerous flake that will peel off the wall if the slightest force is applied to it. The AI just generates potential solutions to the problem once the holds are found/placed. Certainly, there's some interesting conversations about how satisfying it is to solve a rubick's cube using somebody's algorithm vs. just figuring it out, but its not like the computer is inventing a rubick's cube.

Embedded in your comment is the idea that AI might create boulder problems or routes in climbing gyms, and the human (or eventually robot) just follows that plan in bolting the holds to the wall. I expect that for a long time, AI generated climbing routes would rarely be good, but would consistently be physiologically impossible, feature uninteresting movement, or be too easy.

Its easy enough to shotgun holds up onto the wall based on some imagined sequence, the real skill of route setting is to (as the GP pointed out) figure out what's physically possible and also fun and challenging.

rockfishroll · a year ago

Spotting a refugee from rockclimbing.com on hacker news was not on my bingo card for the day. But I guess if I'm here (writing novels about route setting) then I shouldn't be surprised other people are too.

rockfishroll commented on Grabby Aliens: A Resolution to the Fermi Paradox grabbyaliens.com/... · Posted by u/MrBuddyCasino

musictubes · 3 years ago

To me the Fermi paradox is easily explained by the speed of light being a hard limit on how fast something can go and the fact that space is absolutely enormous. Every expectation of multi planet civilizations simply hand waves away physics. How would they move between stars? "You know, alien stuff. They'll figure it out."

There are also unstated economic assumptions that don't make a lot of sense. Why would they leave their planet anyway? A civilization wealthy and advanced enough to consider traveling to other planets probably does not have a population big enough to support the kind of large scale emigration needed to set up big colonies. Wealthy societies have fewer children. Then of course there is the question of why would you ever leave a planet with such advanced technology and apparent wealth? I would much rather live in any city on earth than a colony on the moon or Mars. How long would it take for those colonies to be as attractive a living space as the place we have right now?

rockfishroll · 3 years ago

I think your first point ignores one of the fundamental insights of the Fermi Paradox, which is that while space on an astronomical scale is massive, so is time. The milky way galaxy is ~100,000 light years across. So traveling at 1% of the speed of light, you could go end to end in 10,000,000 years. That sounds like a long time, but it's really not.

The earth is ~4.5 billion years old. So we can say with certainty that it's possible (not guaranteed) to become a space faring race (although not a galaxy crossing one) in 4.54 billion years. If we tack the amount of time it takes to cross the whole galaxy end to end we get 4.55 billion years. The milky way galaxy is 13.61 billion years old. That means the galaxy had 9.06 billion years worth of chances to churn out a another planet that could have expanded across the galaxy from edge to edge and been here waiting when humans arrived on the scene. Planets with Earth like conditions are certainly rare but my, admittedly limited, understanding is that they're not "1 in 9.06 billion years" rare.

There are obviously other constraints here. I think your second point about wealthy technological races potentially stabilizing at zero population growth is totally reasonable. But I think the fact that space's apparent scale doesn't actually matter is the whole reason the Fermi Paradox was such an "ah-ha!" moment for many people. The reason it's a paradox is that, given all of our assumptions for variable values in the Drake Equation at the time, it really seemed like we should have met some aliens. The point was that if distance wasn't the hurdle we thought it was in the equation as currently defined, then we were either missing some relevant variables, or we had made some bad assumptions for the ones we had.