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KineticLensman

7,349 karma · joined February 28, 2014

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KineticLensman··on SBCL: A Sanely-Bootstrappable Common Lisp (2008) [pdf]
At Uni we had a stable of Vaxen.
KineticLensman··on 3D-Knitting: The Ultimate Guide
> As I understand it, a big part of produced clothing just goes straight to waste to begin with.

My niece runs a business that relies on the way we discard clothes. She buys clothes from suppliers in India who source them from the bales of discarded clothes sent to them from Europe. Her suppliers have in effect sorted through the mountain of discards to find the ones that have sufficient value to sell back to us. She specifically buys clothes that have 'vintage' appeal (think tailored jackets rather than hoodies) and sells them primarily to students in a northern English city. Her business has done well enough to move from market stalls to a dedicated high street store and she is just branching out into 'vintage' kids clothes.

KineticLensman··on Rob Grant, creator of Red Dwarf, has died
Yes. Kryten had definitely been at the pies
KineticLensman··on Dyson settles forced labour suit in landmark UK case
In the UK, if a homeowner (customer) pays a company to clear domestic rubbish, and the company illegally fly-tips it, it's the homeowner who gets chased. The law requires them to check that the company is legit.
KineticLensman··on An interactive intro to quadtrees
In Vivaldi, point insertion seems to be x-offset to the left or right of the mouse click.
KineticLensman··on Even the Mars Rover Uses Zip Ties (2021)
When I discovered that you can daisy chain cable ties, I felt that I’d found a new law of DIY physics
KineticLensman··on Hugging Face Skills
See 'genetic programming' for techniques that are sort of based on this idea. Typical approach is to have a problem representation (gene analogues) that can be used to create a population of different individual solutions. Test them all against a fitness function and retain those that are 'best' according to some metric. Then create (breed) some new individuals who have some of the characteristics of the winners, perhaps mutated somewhat, insert these into the population. Repeat until you have solved the problem or have a good enough solution.

Challenges (apart from the time taken) are coming up with a good enough gene representation that captures the essence of the problem, building an efficient fitness function, and avoiding local maxima - i.e. a solution that is almost but not quite good enough, but from where you can't breed a better solution.,

KineticLensman··on A NASA Engineer Discovered a World of Semi Truck Aerodynamics by Accident
> despite air being the same everywhere.

The air may be the same everywhere, but roads and safety laws aren't.

KineticLensman··on The Mongol Khans of Medieval France
So he was a Robber Ducky?
KineticLensman··on Elvish as She Is Spoke [pdf]
E.g. with phrases such as "Let us go and respire the air"

(which I am now keen to use in an actual conversation)

KineticLensman··on A Visual Source for Shakespeare's 'Tempest'
For another work inspired by The Tempest, Forbidden Planet! Caliban == Monster From the Id, if you squint hard enough
KineticLensman··on What Is Ruliology?
Actually, the bottom layer from which God created the cosmos was originally Computer Science. Where else do you think all the chaos came from?
KineticLensman··on An anecdote about backward compatibility
Cue obligatory reference to the programmer archaeologists in Vernor Vinge's novel A Deepness in the Sky. Their job, on starships, is to safely bodge the multiple strata of software that have accreted since Mankind left Earth, centuries before.
KineticLensman··on A History of Haggis (2019)
> Once again, it was the English who provided the spur.

I'm continuing with this initiative by proposing a new variant on Haggis: "Shepheard's Haggis". It's basically a Shepheard's pie - which is essentially lamb mince+stuff topped with mashed potato - made using haggis instead of mince. If I have any leftover gravy in the freezer that gets mixed into the haggis to moisten it a bit. I've making this for years.

For added heresy I replace the neeps with baked beans, themselves livened up with some sumac or similar.

KineticLensman··on Why medieval city-builder video games are historically inaccurate (2020)
I don't have specific links to this but it's more general reading of tech / military history over the years. I'd love to see a definitive study of the tech tree behind steam engines, but I do know that making bullets/shells precisely fit gun barrels took a long time, and this is analogous to making pistons in engines that don't lose pressure. The first mine-pumping steam engines were the size of small houses and stupidly inefficient, but, assuming lots of coal, they were still cheaper than having people / animals working water pumps all day. And they provided a good opportunity for engineers to properly iterate the technology with commercial pressure. They had a lot to learn though trial and error about how to optimise the things, e.g. adding condensing chambers that separated out initial water heating from power generation. This was all way beyond what the Romans could have achieved.

As you say, with retrospect we can see the Aeolipile as a tech demo, but at the time it was an interesting novelty with zero practical application.

KineticLensman··on Why medieval city-builder video games are historically inaccurate (2020)
> they invented a steam engine[0]

The Aeolipile was not a functional steam engine - it was essentially an unpressurised two-spouted kettle that span on an axle. It had no way of maintaining enough pressure (no valves) to do useful work and the metal working techniques of the day weren't good enough to contain useful pressure without exploding. Real steam engines only came about after people had spent centuries building cannons that didn't explode.

The first practical application of steam engines was pumping water out of deep coal mines (which the Romans didn't have or need) where it didn't matter if the engine was both underpowered and massive. Even after these engines became commercially viable, it took another 70 years or so for the engines to become small enough to be mounted on vehicles.

KineticLensman··on Douglas Adams on the English–American cultural divide over "heroes"
> Every episode of the show conforms to a formula where he gets suspicious of one of the other characters in the show and we spend the episode wasting time while it's finally determined that the suspect of the week is actually innocent.

Something like this applies in the UK Midsomer Murders. Specifically, in the episodes where one of the suspects has a prior criminal record, they always get grief from Inspector Barnaby's current sidekick but are then proven innocent of the current crime. However, if an old police colleague from Barnaby's past offers to help, they are always guilty of something.

KineticLensman··on Lunar Radio Telescope to Unlock Cosmic Mysteries
I do like poetry, but if we are looking at a crescent moon, in our night, it means that the bulk of farside is facing toward the sun, and will therefore be brighter than nearside
KineticLensman··on Lunar Radio Telescope to Unlock Cosmic Mysteries
> the fully illuminated “dark side”

Personally, I don't find the phrase 'fully illuminated “dark side”' to be a convincing alternative to the physically more accurate term 'far side'. Of course NASA has only just emerged from the Earth's dark side as I write this (UK here, mid-morning), so I'm not expecting an immediate response from them.

And yes, I do know that 'side' is itself not entirely accurate because of libration [0] but that's a different hill to die on.

[0] https://en.wikipedia.org/wiki/Libration#Lunar_libration

KineticLensman··on Lunar Radio Telescope to Unlock Cosmic Mysteries
It’s far side, not dark side. The moon doesn’t have a dark side anymore than the earth does
KineticLensman··on JRR Tolkien reads from The Hobbit for 30 Minutes (1952)
Exactly.

In fact, when Gandalf catches up with Aragorn/Legolas/Gimli in 'The White Rider' chapter, he explicitly tells them that Sauron has committed a major strategic blunder: attacking too early, as soon as he thought the Ring was in play. If he'd kept some forces back to guard Mt Doom, he'd have been alright. Especially because, as later becomes clear, Mt Doom isn't a normal volcano where you could just lob the Ring in from your low-flying eagle. The Cracks of Doom are in a chamber deep inside the mountain.

KineticLensman··on JRR Tolkien reads from The Hobbit for 30 Minutes (1952)
> "couldn't they just fly to Mount Doom and drop the ring?"

If the allies were counterfactually sensible enough to fly the ring to Mordor, Sauron could have been counterfactually sensible enough to station an Orc/Troll Battlegroup at the Sammath Naur, with a Nazgul combat air patrol.

KineticLensman··on JRR Tolkien reads from The Hobbit for 30 Minutes (1952)
Also Pippin and Merry, who are basically annoying teenagers in the films, even if they do some useful things.
KineticLensman··on JRR Tolkien reads from The Hobbit for 30 Minutes (1952)
> Tolkein of course denied this .... and the timing wasn't right

Just to expand on this, substantial portions of LOTR were written well before the atomic bomb became public knowledge, e.g. Tolkien had written first drafts of Book 4 (Frodo's journey to Mordor with Sam and Gollum) by 1944. In other words, it was already a fundamental plot point that the ring should not be used even as an ultimate weapon.

The depiction of war in LOTR is perhaps more closely associated with Tolkien's personal experiences in the war of 1914-18. The dead marshes in particular have similarities to the trenches of WW1

KineticLensman··on JRR Tolkien reads from The Hobbit for 30 Minutes (1952)
Tolkien’s orc dialogue in TLOTR is actually very humanised in some ways – the orcs moan about their bosses, complain about rival teams, are concerned about completing their tasks, being punished for failure, etc, etc. When they aren’t fighting, they come across as petty functionaries in a totalitarian state.
KineticLensman··on James Moylan, engineer behind arrow signaling which side to refuel a car, dies
But they are still all at sea
KineticLensman··on The British empire's resilient subsea telegraph network
It was strategically important in WW1 because the British could communicate with the colonies with very chance little chance of messages being intercepted. The Germans, in contrast, didn't have access to their own transatlantic channels and had to use plain-text messages on cables that the UK/US controlled (US operators disallowed coded comms).
KineticLensman··on Ask HN: What did you read in 2025?
Frankenstein. Superb science fiction, very readable even though written 200 years ago. And Wuthering Heights, which strangely like Frankenstein, has a complex narrative structure and an unhinged, obsessive central character
KineticLensman··on The ancient monuments saluting the winter solstice
Where I am the sunset is already three minutes later than its earliest time but it will be another two weeks until the sunrises start getting earlier
KineticLensman··on The biggest CRT ever made: Sony's PVM-4300
Some time in the early 1990s I worked with a Macintosh of some variety that had a massively heavy CRT display. It was a real bummer when we were asked to do offsite customer demos, but luckily my back and knees were young enough to carry it upstairs. In retrospect, this is probably why my boss took me to the demos, which was actually quite useful career-wise.
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