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Square Theory

https://aaronson.org/blog/square-theory
314•aaaronson•5h ago•62 comments

Why the Original Macintosh Had a Screen Resolution of 512×324

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185•edwardjxli•5h ago•78 comments

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How a hawk learned to use traffic signals to hunt more successfully

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283•layer8•9h ago•90 comments

Launch HN: Relace (YC W23) – Models for fast and reliable codegen

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LumoSQL

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192•smartmic•10h ago•76 comments

BGP handling bug causes widespread internet routing instability

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215•robin_reala•9h ago•99 comments

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172•kermatt•7h ago•64 comments

Roundtable (YC S23) Is Hiring a Member of Technical Staff

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1•timshell•3h ago

I salvaged $6k of luxury items discarded by Duke students

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103•drvladb•4h ago•114 comments

The Art of Fugue – Contrapunctus I (2021)

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84•xeonmc•7h ago•40 comments

Outcome-Based Reinforcement Learning to Predict the Future

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Comparing Docusaurus and Starlight and why we made the switch

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GitHub MCP exploited: Accessing private repositories via MCP

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Space Selfie

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Worlds first petahertz transistor at ambient conditions

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83•ChuckMcM•3d ago•56 comments

Cows get GPS collars to stop them falling in river

https://www.bbc.co.uk/news/articles/cj4229k744lo
52•zeristor•3d ago•54 comments

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CSS Minecraft

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1067•mudkipdev•1d ago•122 comments
Open in hackernews

Cows get GPS collars to stop them falling in river

https://www.bbc.co.uk/news/articles/cj4229k744lo
52•zeristor•3d ago

Comments

zeristor•3d ago
Found via:

https://diamondgeezer.blogspot.com/2025/05/local-news.html

Sometimes the provenance is just as interesting

aaron695•12h ago
Old tech, but this video impressed me - https://www.tiktok.com/@halterhq/video/7504837843571838215

It's more than a virtual fence, it can move them and has health checks / in heat.

I don't know if you can split the herd once together but you can manage more mobs, bring them in groups (Like small and large) for milking or feeding.

You could be able to tell if they mated as well or ever direct the bull towards heifers that haven't.

samplatt•12h ago
...are fences too costly, or something?
account-5•12h ago
Pretty sure they might be cheaper that £10k a year.
jaoane•12h ago
Maybe after ten years.
bartvk•12h ago
Yes, fencing is very costly especially because cows are strong. I grew up on the countryside and learned a couple of things. Fencing not only needs to be built but also maintained. You can also use electric fences but that's basically the same, and you need to run power.

Cows are stubborn and especially in summer, when they found out that the water cools them down, they get into the water. But often they can't get out, at least how N/W-European pastures are. So you get a tractor and pull them out, but then they learn that :-)

What actually is necessary, is that there's enough shade. But trees need to maintained so a lot of farmers cut them down.

Note that my knowledge is limited and perhaps already out of date.

Cthulhu_•11h ago
Modern solution, a half-open barn with a roof of solar panels. I don't understand why pastures don't have a roofed area.

...solar panels that power the electric fence or 5g broadcaster for the GPS collars, lol.

bartvk•10h ago
It's a hassle, it's in the way of mowing.
aziaziazi•10h ago
Trees cools down what’s beside not only by their shade but also with evaporation. The cooldown effect of a forest is way stronger that and solar panel shaded area.
rcxdude•11h ago
Would cheese off a few people in the area, since along that stretch of river there's a popular riverside picnic spot and a mooring area for houseboats.

(Also, it's a common, which in England means massive piles of red tape to build anything on it)

badmintonbaseba•11h ago
The cows graze in parks shared with people. You don't want to fence around the people, just the cows. This is an example of a field that the cows visit regularly:

https://maps.app.goo.gl/iYbCeJu8fvrmuAXz9

ceejayoz•8h ago
The cows are on public, multi-use land.

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

gorgoiler•12h ago
If I recall correctly, Cambridge City are using off the shelf grazing tech to help with a one off problem.

These digicowbells have a more common application of managing grazing herds in order to rotate them evenly through pastures without having to go out and redeploy fencing every week. If you want Daisy et al to let the north half of the field regrow you just draw a line around it in the app and it’ll get left ungrazed. Popular in large commonland projects too where you want to dynamically leave parts of the land fallow.

It’s also just handy to give your cattle a mobile device. You can monitor their health and breeding status. In the spirit of the dad joke about asking if iPhones “can also make phone calls!?”, it wouldn’t be crazy if these things shipped one day with some kind of two way communications. If Gertrude gets stuck ten miles up the valley it could be handy, perhaps, to see what the problem is before you fire up the brummy quattro (Land Rover.)

meigwilym•8h ago
This is a great idea. A drone would also work, but would need favourable weather.
chaps•12h ago
What is this article. GPS has been used for cow tracking since the 80s at least. Some of the companies have gone on to do ankle monitoring of people.

Turns out GPS isn't that accurate :)

jadamson•11h ago
It was less accurate in the 80s/90s, if you were a civilian.

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

mschuster91•11h ago
Meanwhile in German politics: "We don't need 5G on every cow facility" [1].

Turns out, modern agriculture needs good mobile connectivity wherever cows are being held...

Politics aside, what I don't get is why they don't go and raise temporary electric fences with gates - that's how cows are held in alpine regions. And a side note, if you go on a hike in alpine regions in Germany, please close the gates after you pass through so that the cows don't escape.

[1] https://www.spiegel.de/politik/deutschland/anja-karliczek-br...

DocTomoe•11h ago
I guess we would just set up a cow fence.

These GPS trackers help find cattle, possibly making rescue efforts faster and thus cheaper, but they do not prevent them falling into that river in the first place. A fence does.

I know, this is the classical "NASA builds a 1 million dollar Space pen, Russians use pencil" story - but sometimes, high tech is not necessary to solve problems that have been solved for centuries.

Doesn't mean we don't need better infrastructure. Just that we should avoid overcomplicating things.

readams•9h ago
If you read the article, you'll find that in fact the collars do prevent them from moving toward the river using sound, vibration, and shocks.
mrmanner•9h ago
> they do not prevent them falling into that river in the first place

The article explains pretty well how the devices prevent cows from falling into the river:

> Solar-powered GPS devices emit a high-pitched sound as the animal moves through a boundary zone towards the water, with a mild electric pulse delivered if it fails to turn around.

DocTomoe•9h ago
So the cow learns there is a 'good zone' or a 'bad zone' to be in. And how does the cow - which now may be panicking - know it does not exit the 'bad zone' by, let's say, jumping into the river?

Applying human intelligence to bovines may be misguided.

rcxdude•9h ago
They're not particularly dumb animals (similar to the average dog), generally they do get the idea pretty quickly. (There is a gradient of warning as they approach the edge of the zone, so it's not just suddenly a big shock)
BenjiWiebe•2h ago
I'd compare their intelligence to cats, in that a dog uses its intelligence to please its owner, and a cat uses its intelligence to do whatever it pleases. :-)
jadamson•8h ago
Someone below linked to a company providing this technology and it seems we do now have remote control cows (no panicking that I can see):

https://www.instagram.com/halterhq/reel/C_hq8_iSnCH/

DocTomoe•7h ago
I ... honestly don't know if I should be impressed or horrified. Essentially, they have become cyborgs. Mootrons?

I stand corrected either way.

mschuster91•6h ago
It's inarguably smart, but... freaking dystopian.
jll29•9h ago
Differential GPS is already a cornerstone of precision farming, because on a very lond field harvesting a 2cm border stripe (or not) implies substantially more yield (or not).

Whether each cow needs 5G we can debate - but usually once a service exists, it generates novel ideas that use the service. It's called "innovation", and I invite politicians unfamiliar with the subject (German or otherwise) to attend my lecture with the same title.

hommelix•3h ago
I remember reading that a cow health monitoring in the Netherlands would generate about 20 GB of data daily (location, temperature, how many hours walking vs lying). So 5G makes sense in some agricultural setups.
emmelaich•11h ago
Classic kids book: https://bestkidsbooks.com/selection/the-cow-who-fell-in-the-...
gadders•11h ago
Our neighbour's cow walked down a slope to drink from a river in the field near us. Unfortunately the slope was a bit muddy and it couldn't get back up again.

After we all tried to give it a bit of a push, we had to admit defeat and call in the Kent Fire Service Animal Rescue Unit: https://www.kent.fire-uk.org/news/meet-crew-specially-traine...

williamdclt•9h ago
> After we all tried to give it a bit of a push

Not a countryside guy: sounds kinda dangerous? If the cow panics (or gets annoyed/angry), getting kicked by a hoof would seem like a direct trip to the hospital? Or if it slips and falls on someone (is that possible?)

gadders•9h ago
It was pretty tentative, and from memory we used a strap across its backside, rather than stand directly behind and push by hand.

I did also have to deadlift a wet sheep out of a stream once and carry one from one field to another. That was a lot easier.

jaredhallen•7h ago
I've been kicked by cows a fair number of times. I'm sure it could be serious under the right circumstances, but usually it just hurts a lot. Interesting fact, unlike horses cows can kick sideways.
josefritzishere•5h ago
People do not normally imagine Cows administering ninja kicks but they kinda do.
potato3732842•7h ago
The cow knows from situation and body language that everyone is trying to help. Panic is not likely.

As with most things, it's not as dangerous as the internet would have you think. Don't sneak up it and hit it and you'll be fine.

crooked-v•32m ago
Also, horses are way more high-strung than cows.
ViscountPenguin•11h ago
The local council was using these things to let cows graze Wanstead park for a while, they were really cute.
scowby•10h ago
There is Australian research into virtual fencing https://www.csiro.au/en/research/technology-space/it/Virtual... that has been commercialised. There’s a lot of expense in fencing and being able to herd cattle remotely is one of the benefits, you can also define areas to avoid, like rivers and dams without putting a fence in place.
amelius•10h ago
Different solution: just release some turtles on the river bed.

https://www.youtube.com/watch?v=4_cS4Nf47jM

MarkusWandel•10h ago
Dunno, once upon a time the low tech solution was... a fence.
is_true•10h ago
There's another "low tech" solution. Just pump the water to a safe place. You can even create an area with sprinklers activated by movement.
_joel•10h ago
Fences require maintenance too, especially near rivers. Plus these aren't traditionally farmed cattle, so there's that.
metalman•9h ago
yes, true, my niehbors have a biodynamic farm with cattle, but the farm dogs has decided to start monitering the activity on all the adjacent farms.....quite odd hound dog....and so has been fittedwith a gps collar, which is proving to be just further distraction....as the dog is supper cagey, and silent....except when going into full hound dog baying mode....checks the road both ways...and slinks off if there is traffic....only darts accross when it's all clear. There was a full robot dairy farm up the road, but they sold there quota....likely retiring to somewhere exotic.
mbeavitt•9h ago
The historical reason is that canals were originally built to facilitate horse-drawn boats, and as such there are no fences. The modern reason is that people use the canals all day, for hopping on/off houseboats and rowing training - putting up fences just for a few cows would make many people upset.

FYI, I live right next to this area and it's almost as central as you can get in Cambridge, so it's super busy - people and cyclists coming through this field all the time, including myself. There are plenty of fences around the roads and land borders of the commons, but it's just the canals that have these special uses that require a lack of fences.

https://maps.app.goo.gl/PifHtYpg1u2SfojF9

rascul•8h ago
> The historical reason is that canals were originally built to facilitate horse-drawn boats, and as such there are no fences. The modern reason is that people use the canals all day, for hopping on/off houseboats and rowing training - putting up fences just for a few cows would make many people upset.

Seems like maybe the fence could be put up some reasonable distance away from the water to leave enough usable space along the shore for people. I see that done here where I'm at sometimes.

542354234235•8h ago
Of course you could put up a fence. This isn’t a situation where the collars solve a previously unsolvable problem. But fences cost money, both the build and to maintain. Fences restrict movement for people (and wildlife), which is undesirable. You have to build gates for people to use, and if it is a busy area you need a lot of gates. People fail to close gates and cows get through them. If you need to move vehicles or equipment between the canal and the field, then you need some large gates as well.

The collars allow for restricting the movement of cows, while leaving the entire area open and unencumbered for everything else.

ajb•1m ago
So, the way you've written this comes across as if you think that's a canal running across midsummer common. For the benefit of those unfamiliar, it's not a canal, it's the River Cam. It may well be that the reason for no fences is boat transport, just wanted to make clear to readers that canals aren't involved here.

There definitely was serious boat transport in the area- midsummer common hosted a fair; historically fairs were actually vital to the economy as a lot of goods were exchanged there, and even more contracts for goods. Nearby Stourbridge fair was the largest in Europe: https://en.m.wikipedia.org/wiki/Stourbridge_fair and the inspiration for Bunyan's "Vanity fair"

erehweb•11m ago
We've heard of Chesterton's fence. This is a rare example of Chesterton's non-fence.
sharklasers123•10h ago
Pretty awesome tech, virtual fencing with noise and vibration, assume this is using https://www.halterhq.com. It can even be used to get them to walk to the shed for milking, or virtual break fencing
tordasnes•9h ago
From the pictures is looks like they're using https://www.nofence.no/en/
jll29•9h ago
Thats for posting about "cow GPS" just as I was looking for further examples for "geofencing" for a book I am writing, apart from FourSquare. ;-)
aa-jv•8h ago
One of the great things about Cambridge, besides its bookstores and libraries, are all the green spaces.

Every time I visit (for synth-diy, mostly) .. I take a few hours and stroll along the cam, and through the city, and just .. enjoy the space.

Even though it is a busy and industrious little town, one can find a tree to park under and read for a few hours and thoroughly enjoy the environment. And yes, occasionally get interrupted by a curious bovine or two.

Also, you haven't lived until you've fallen off a punt or so, or at least enjoyed the view of others doing it while sipping on some suds at Granta on Mill Pond.

Bonus points for bonking ones noggin on the Mathematical Bridge while you're at it.

I really get a feeling that the city was set up for idle thought by the studious and curious. No surprise that it loves its cows too.

josefritzishere•7h ago
Nobody knows how to build a fence in Cambridge?
parkersweb•9m ago
Ah - I live just a half mile from these fields. It’s one of the historical quirks of the city; lots of common land open to the public, grazed by cows.

Although there’s fencing on other boundaries of the grazing land it simply isn’t practical to fence off the river - and as someone who also rows on the river I usually see a cow in the water at least once a year, so it’ll be interesting to see if they work!