Ask HN: What did you find out or explore today?

Doesn't matter what domain and how big or small.

67 points | by blahaj 14 hours ago

52 comments

  • lanyard-textile 3 hours ago
    I found out my crimson-bellied conure is laying an egg today! She's nesting in some towels now, chirping away while she works on laying it.

    Having an egg is relatively hard on parrots. I've given her lots of food and warmth to prepare. She is comically hungry -- she's usually not such a big eater, but she's happy today to be scarfing down her apple slices, fruit pellets, and safflower seeds.

    She usually sleeps at the bottom of her cage, beneath a towel I put down for her. It's already unusual for parrots! But tonight she has made quite a nest with her towel: It's folded in half like usual, but she has nuzzled her way between the fold, so she has the towel underneath and on top of her. It's super cute.

    I'm treating her with delicacy but she is determined to be a wild child of a bird. She's still flying around during the day and moving around plenty. I don't think I would be so confident if I had an egg like that inside me.

    She has a stone perch that she likes to nibble on when she's working on an egg. I've wondered if it is some innate need to nourish herself with calcium, or if it's stress relief :)

    So that's my night. Sitting outside of the metaphorical delivery ward with a metaphorical cigar, making sure she lays this egg that isn't even fertile to begin with! Birds :)

    • yMEyUyNE1 46 minutes ago
      > I've wondered if it is some innate need to nourish herself with calcium, or if it's stress relief :)

      methinks: Calcium is required to make the egg shell. Calcium supplements would help, just in case "Life finds a way".

    • aryehof 1 hour ago
      A beautiful pause in my day reading this - many thanks. Would love to see a photo!
  • q-base 4 minutes ago
    I have started exploring Seneca/stoicism again. Prompted partly by a recent submission here, partly by personal reasons. Instead of consuming other peoples interpretation of stoicism I decided to go as close to the source as feasible for me. I have read Letters from a stoic a number of times before and my copy is filled with highlights, but this time I think I will try to limit myself to one or two letters a day and then really think about them properly.

    The first one really hit me hard and prompted me to write out my own thoughts (https://jesperreiche.com/seneca-letter-2/) whether I will keep doing that I am a little unsure. It feels on the border of how personal I want to be/share on my blog.

    P.S. I can see the irony in writing about me going to the source instead of consuming other peoples interpretation and then sharing a link to my own interpretation :)

  • atraac 24 minutes ago
    I've learned that being truthful in your resume as a SWE doesn't work anymore. I've had nearly 0 response rate to my applications, even if I was nearly a perfect match. Dude that we fired a while ago for being abysmally bad and non-productive gets interviews, raises and just got into ycombinator backed company by making up 75% of his resume(which I saw). We need a reset, this is getting ridiculous.
    • geuis 10 minutes ago
      Sounds like you could use some resume review help. And I'm not talking about bs AI linkedin level "resume review". I mean some review from someone who's been in the industry for a while. There's a way to contact me via my profile. If you can find that I'll try to help you out.
  • aaronbrethorst 6 minutes ago
    My home office gets up to about 1500ppm of CO2 by the end of the workday, which explains a lot about why I often feel exhausted after the end of a long, uninterrupted session in there (especially when I’m on back to back zoom calls).

    I now have several plants in there that are supposed to be especially good at sucking up CO2, and my sensor reports that the current level is slightly below atmospheric ambient CO2 levels.

    I also wrote up a blog post about the structure of the Washington state legislature, which began its sixty day session for 2026 earlier this week. https://www.brethorsting.com/blog/2026/01/how-the-washington...

  • rcarmo 3 minutes ago
    I am deep down into the rabbit hole of assessing various open source projects to build a custom trackball with a 52mm billiard ball (appropriately, it’s the 8-ball).
  • spenjovewkwhalo 1 hour ago
    The origins of Port and Starboard on ships.

    Chosen to be independent of a mariners orientation.

    Starboard - most sailors were right handed and the steering oar was placed on the right. Star = steer. Board = side of boat.

    Port - as steering oars got bigger, boats tended to dock on the left hand side. This became to be known as “lardboard” which sounded too much like starboard, so it was changed to “Port” (as in the side typically facing the port side.

  • relwin 11 minutes ago
    Recently procured an AirGradient air quality monitor and set up the build environment so I can customize its reporting capability and perhaps add some different sensors. Also didn't realize how much CO2 builds up during the night in my bedroom. Will have to mitigate this as I believe this contributes to my poor sleep habits.
  • omgmajk 17 minutes ago
    I explored the programming language nim a bit deeper for use in game programming with SDL3 bindings, but I came to find out that compiled nim code on Windows often triggers anti-virus because, from what I hear from people, nim is used a lot in malware development currently. Which is a shame because I really like that language. I haven't tested it myself, it's just things I have heard and read. Someone on r/gamedev told me to write the code in nim, generate C code and then compile it with zig cc.

    If anyone has any experience with this, please do chime in :)

    • imadethis 8 minutes ago
      I don't have any nim experience (sorry!) but I'm also exploring SDL3 with odin. I was able to get a naive battleship clone up and working very quickly, pretty neat. Next step is the new SDL3 GPU API.
      • omgmajk 6 minutes ago
        I haven't looked into Odin that much but I hear it's swell, so maybe I should!
  • TimesNewMe 1 hour ago
    I went on a tour of a miso factory today and learned about how it's made!

    What surprised me the most was that shiro (white) miso and aka (red) miso are both the same mix of soybeans, salt, and rice malt but fermented for different periods of time. As the miso ferments for longer, its color becomes darker while its flavor becomes milder and more complex. Beyond 3 years of fermentation, you get diminishing returns as its flavor becomes too acidic.

    After the tour, we got to sample some of the naturally fermented 3 years old miso, and it was easily the best I've ever had. Most miso you can buy in a grocery store is created through forced fermentation over a few months, so if you ever get a chance to try naturally aged miso I would highly recommend!

  • geuis 13 minutes ago
    Screws weren't standardized until ww2. And even then, they really haven't been.

    Related video for those curious: https://www.youtube.com/watch?v=AKNB04slCUA&t=3s

  • ilinx 2 hours ago
    I’m reading Domain Driven Development and learning why so many of my projects have been tough to maintain.

    I also recently learned that you can get ancient coins for very little money if you don’t care about resale value or need them to be in pristine condition. I bought some coins from kingdoms that I’d never heard of. Many are thousands of years old! It’s fun holding a piece of history like that.

    • p_v_doom 12 minutes ago
      > I’m reading Domain Driven Development and learning why so many of my projects have been tough to maintain.

      Oooh, thats a good one. Next read the Architects paradox, Why Greatness cannot be planned and Understanding Variation and your views of the world will be forever altered. Or pick up "Architecture Modernization" by Nick Tune if you want more tools to do stuff and if you do not want to achieve enligntenment.

      _____

      Where did you acquire cheap ancient coins? ebay? May be cool to get some for my dnd group

    • dr_dshiv 11 minutes ago
      Ancient coin collecting is an awesome hobby! I have one that scholars think was made by / designed by Pythagoras himself. For a few hundred bucks!

      Recently I learned that only 3% of Latin works from 1450-1700 (including renaissance and scientific revolution) have been translated. Secondrenaissance.ai

    • rocketbin 13 minutes ago
      Any recommendations on where to acquire?
  • p00dles 17 minutes ago
    Today I took the subway at a different time than I normally do, and I saw a very different mix of people. Fascinating.
  • kunley 16 minutes ago
    I learned that my fav part of Apennines is famous for a lack of light pollution and thus is an astro-tourism target. Never paid attention to that aspect.

    I also learned that on Aug 12th this year a total eclipse of the sun can be observed from certain parts of Spain.

  • willvarfar 1 hour ago
    I had a great euphoric epiphany feeling today. Doesn't come along too often, will celebrate with a nice glass of wine :)

    Am doing data engineering for some big data (yeah, big enough) and thinking about efficiency of data enrichment. There's this classic trilemma with data enrichment where you can have good write efficiency, good read efficiency and/or good storage cost, pick two.

    E.g. you have a 1TB table and you want to add a column that, say, will take 1GB to store.

    You can create a new table that is 1.1TB and then delete the old table, but this is both write-inefficient and often breaks how normal data lake orchestration works.

    You can create a new wide table that is 1.1TB and keep it along side the old table, but this is both write-inefficient and expensive to store.

    You can create a narrow companion table that has just a join key and 1GB of data. This is efficient to write and store, but inefficient to query when you force all users to do joins on read.

    And I've come up with a cunning forth way where you write a narrow table and read a wide table so its literally best of all worlds! Kinda staggering :) Still on a high.

    Might actually be a conference paper, which is new territory for me. Lets see :)

    /off dancing

    • anonu 6 minutes ago
      look into vector databases. for most representations, a column is just another file on disk
    • nurettin 1 hour ago
      You mean you discovered parallel arrays?
      • hahahahhaah 11 minutes ago
        Whats a good place to see parallel arrays defined. I have no data lake expetience. Know how relational db works.
        • nurettin 1 minute ago
          I mean,

              Table1 = {"col1": [1,2,3]}
              Table2 = {"epiphany": [1,1,1]}
              for i, r in enumerate(Table1["col1"]):
                print(r, Table2["epiphany"][i])
          
          
          He's really happy he found this and will represent this in a conference
      • willvarfar 1 hour ago
        specifically I've discovered how to 'trick' mainstream cloud storage and mainstream query engines using mainstream table formats how to read parallel arrays that are stored outside the table without using a classic join and treat them as new columns or schema evolution. It'll work on spark, bigquery etc.
  • giraffe333 3 hours ago
    I was reminded of the US Constitution's 10th amendment and reading some of the history around it.

    > The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

    Very relevant to what's going on today with National Guard and ICE deployments.

    https://www.axios.com/2026/01/14/10th-amendment-ice-trump-il... (or please google whatever source you find reliable about the topic)

    • Fezzik 1 hour ago
      Also related and worth a read, I think, is the Supreme Court case Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579 (1952). The content of the dispute is different, as it involves the President seizing private property, but it is (one of?) the seminal cases regarding the scope of presidential powers. Justice Jackson’s concurring opinion is, at least for now, considered the best articulation of when the President may take unilateral action.
  • blahaj 14 hours ago
    I found out today that the location header of an HTTP redirect can be a tel:+ URI and phone's will actually ask you whether you want to call that number.
    • mediumdeviation 3 hours ago
      Links can have that as their href and it will also work as you'd expect. It's the telephone equivalent of the more well-known mailto: scheme
      • econ 2 hours ago
        Now we should add a ?message= query string to be read out loud in the users voice.
  • p_v_doom 20 minutes ago
    That I promised my boss to check the office fridge for what we need for the team breakfast and forgot about it.

    Also that Newfoundland has a pretty unique music tradition, that captures what irish music sounded before the Great Famine

  • 4b11b4 12 minutes ago
    Google Earth Engine's Foundation model via the ITU's seminar! This thing is incredible!
  • GarnetFloride 2 hours ago
    Reading up on the history of information management, and the real killer app for paper was double-entry bookkeeping, which made Venice rich and contributed to starting the Renaissance.
  • abetusk 1 hour ago
    That the FOSS bazaar broke off into megachurches while still maintaining a healthy small scale and independent bazaar [0]. That FOSS sustainability is much more complicated than just "throw money at it".

    That there's "metal paste" [1].

    That the zodiac killer's messages have been cracked for five years now (I didn't know they were cracked to begin with) and that it was a shift and substitution cypher [2]. The telltale clue was that the symbol frequency was uniform but under shift it become non-uniform.

    How to solder those pesky connectors that come on the tiny servo motors you can get from Aliexpress [3].

    That Firefox only has 2.3% market share [4].

    Multiscale 3d truchet patterns are freakin complicated [5].

    That prioritizing tasks by the linear combination of priority and effort remains a good strategy.

    [0] https://opensourcesecurity.io/2026/01-cathedral-megachurch-b...

    [1] https://www.youtube.com/watch?v=Ys-RMVJ89dk

    [2] https://www.youtube.com/watch?v=3CJsKJ0XKP4

    [3] https://www.youtube.com/watch?v=KHulZtR2Qkg

    [4] https://gs.statcounter.com/browser-market-share

    [5] https://archive.bridgesmathart.org/2018/bridges2018-39.html#...

    • nailer 1 hour ago
      Whoa. Via Grok:

      Solved Zodiac Killer ciphers:

      • Z408 (July 1969): Solved in days by Donald & Bettye Harden.

      Message (with misspellings): “I like killing people because it is so much fun it is more fun than killing wild game in the forrest because man is the most dangeroue anamal of all to kill something gives me the most thrilling experence it is even better than getting your rocks off with a girl the best part of it is thae when I die I will be reborn in paradice and all the I have killed will become my slaves I will not give you my name because you will try to sloi down or atop my collectiog of slaves for my afterlife ebeorietemethhpiti”

      • Z340 (November 1969): Solved in 2020 (after 51 years) by David Oranchak, Jarl Van Eycke, and Sam Blake; FBI confirmed.

      Message (with misspellings): “I hope you are having lots of fun in trying to catch me that wasn’t me on the TV show which bringo up a point about me I am not afraid of the gas chamber becaase it will send me to paradlce all the sooher because e now have enough slaves to worv for me where every one else has nothing when they reach paradice so they are afraid of death I am not afraid because i vnow that my new life is life will be an easy one in paradice death”

  • dang 3 hours ago
    I've been exploring the origins of the 'relational turn' in psychoanalysis that began after WWII and ramped up in the 1970s. Psychoanalysis got vastly more interesting after Freud and I had no idea!
    • nurettin 1 hour ago
      Sometimes all you need in science is an old guy with a pipe accusing people of wanting to bang their mom.
  • defrost 3 hours ago
    Today, and yesterday, I've been poking about the history of what was once the longest steam powered fresh water pipeline in the world

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

    I'm looking into rennovating a massive agricultural machine shed ~ two stories high in the middle built some 80+ years ago using sections of spur pipeline as central upright poles to hold up some beefy jarrah trusses.

    The "verandah" wings flaring out from there were bulit from flimsier timber that's rotting and the iron sheet walls are starting to peel away.

    The posts are of interest as they have old markings and water fittings, tee pieces, etc.

    It's not far from one of the original steam powered pumping stations that moved water through the main line.

  • helltone 3 hours ago
    I'm building in robotics. Setting up a new 3d camera today. I found that the 10m active USB C cable that I bought transfers power in both directions, but only transfers data in one direction, it turns out to be some weird video USB variant. Next I needed to plug a gripper into a modbus controller. That uses an M8 8-pole 20cm cable. The controller manufacturer recently decided to switch from male to female connector, so now the cable needs to be male-male. After searching online for hours, I believe that is impossible to find as everyone only sells male-female cables.

    I'm continuously surprised by how difficult it is to plug things together and how non-descriptive cable "standards" are about the actual capabilities of cables and connectors.

  • numpad0 1 hour ago
    Surströmming, the Swedish can of fermented fish, is strongly recommended to be punctured while submerged in tap water. It is not pasteurized and is actively fermenting in storage, and the content will spray around if opened under atmospheric conditions.

    When transported on cargo flights, they are double packed as cans in a barrel in a crate, and considered UN classified "miscellaneous dangerous goods" with identification number UN3334 "Aviation regulated liquid, n.o.s." with accompanying scary(albeit monochromatic) warning stickers, if at all accepted. When transported on ocean going vessels, they are often required to be in its own shipping container, again double packaged and correctly labeled.

  • khr 3 hours ago
    I found out that the adhesives I've encountered from time to time that remain tacky and easily moved or removed are called "non-hardening" adhesives. This was after using E8000 glue for a headphone repair today.
  • bunnybomb2 2 hours ago
    That running and taking cold showers really do make me more focused! And that i will have to be the one that fixes my life and builds my future. Deep, i know
  • raybb 1 hour ago
    I am in Mexico City and I learned quite a bit about Santa Muerte. Hard to know how much truth there is in what the locals tell me but supposedly people who live in such dire conditions they feel closer to death than to life pary to Our Lady of Holy Death for protection.

    Wikipedia says it is the fastest growing religion in the world.

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

  • happiness0067 2 hours ago
    Been working on sheet cutting optimization for https://measuretocut.com today and it sent me straight down the cutting‑stock / 2D bin‑packing rabbit hole. What started as “wouldn’t it be nice if the site could tell you how to cut your wood sheets optimally?” turned into reading about NP‑hard problems and flipping through old operations research papers like I was cramming for an exam.

    The funny part is how far the mathematical version of the problem is from what measuretocut.com actually needs to output. In reality you have kerf, ugly offcuts, and the fact that nobody wants a cutting diagram that looks like a circuit board. We really have to take into consideration a 2nd optimization, it needs to be an output that a person in a shop can glance at and immediately understand.

  • austin-cheney 24 minutes ago
    Adding arbitrary raw UDP connections to my browser based web tool.
  • biotechbio 2 hours ago
    When you use a microscope to magnify something, the objective (magnifying lens) is literally taking the Fourier transform of the image. The optical system recovers up to a limiting frequency, determining the spatial resolution of the image.
  • Aditya_kachhawa 1 hour ago
    Was reading about version control history and found out Git went from first commit to self-hosting in like a week. Linus was just mad about the BitKeeper licensing thing and hammered it out. Not some grand architecture - just "screw this, I'll do it myself." And somehow that became... everything. Wild.
  • qiqitori 1 hour ago
    Learned about superheterodyne receivers. Recently I've been studying up on RF technology, happened to come across superheterodyne receivers a short while ago, decided to research them today, saw that Technology Connections had a video on them, watched it, and felt reasonably enlightened.
    • brcmthrowaway 1 hour ago
      Are there AI enabled antennas by now?
      • lormayna 1 hour ago
        I don't know about AI antennas, but smart antennas[1] are a things since more than 15 years. Basically they are array of antennas that can change via software the directivity (mainly used in radar systems) or increase/reduce power transmission and direction (this is used in 5G cell).

        1 - https://en.wikipedia.org/wiki/Smart_antenna

  • sneilan1 3 hours ago
    Published an edit today (post dated in Nov. but I've rewritten it 5x now) on my tutorial to use llama3.2:3b to generate fine tuning data to train tinyllama1.1b https://seanneilan.com/posts/fine-tuning-local-llm/ It took a while to figure out that when I made llama3.2 generate json, it didn't have enough horsepower to generate training data that was varied enough to successfully fine tune llama1.1b! Figured that out :) Something you never learn with the bigger models. Every token costs something even if it's a little bit.
  • onion2k 2 hours ago
    I'm exploring writing a point and click adventure, and I've found out that they're basically just hierarchical state machines with a pretty UI. This is useful because it simplifies a lot of things.

    The downside is that now I'm wondering if I could write one in SQL.

  • mbb70 2 hours ago
    I explored the space of valid Spelling Bee puzzles and found out the lowest scoring puzzle is (x)bejkou with 14 points.

    Hoping they do it for April 1st one year.

  • johnfn 2 hours ago
    That lodash-es doesn’t ESM lodash/fp, which means there is no straightforward way of using it with Vite after version 5. God help me.

    I don’t even want to use it, I just want to get legacy code building on a modern version of Vite without rewriting a couple thousand lines of code. Aaaargh

    • mediumdeviation 2 hours ago
      Another fun fact - lodash/fp doesn't deduplicate with lodash when bundled. For a couple of months I was wondering why our app had bundled two copies of lodash. I dismissed it as a measurement artifact at first. It took so long to realize there was actually two copies of lodash and it was because one developer on our team had a preference for fp syntax.
    • esperent 2 hours ago
      > lodash-es doesn’t ESM lodash/fp

      Most of my career has been JS and TS and I have no idea what this means.

      • soulofmischief 1 hour ago
        I'm guessing you're only a few years into your web career, so I'll provide some background. lodash is a popular library that fills in many blanks that pre-2015 JavaScript had. It still provides value in modern JavaScript, but it's no longer as important as it used to be.

        JavaScript is actually based on a standard called ECMAScript. ActionScript shares this standard, as an example. In 2015, we got ECMAScript 5, which modernized JavaScript in many ways. With that came many changes such as ECMAScript moving to a yearly update cadence, in response to the large amount of effort involved in implementing ES5, which came with a ton of changes.

        One of those changes was ES modules, or ESM, which provided an official way for working with modules. The import/export syntax you're used to is a part of that spec. Before this, we had competing non-standard specifications for module loading, such as CommonJS.

        ES5 reduced the need for tools such as lodash, and so it's less common in newer projects. It also is old enough to have been around before ESM was adopted, and is a large project, and so like many projects it either had to completely rewrite everything, or use transformation tools such as babel. If not, the user was responsible for using babel/etc to transform the code. Now, in modern stacks, because this is unnecessary, native support for CommonJS is being phased out, leading to OP's conundrum.

        Now we have TypeScript, and the horrors of JavaScript 10+ years ago are a fading memory.

      • nailer 1 hour ago
        It’s not just you, nobody uses ESM as a verb, I think they mean:

        The package doesn’t export lodash/fp in the ESM version.

  • ff00 2 hours ago
    Found out about finding timing of http requests https://susam.net/timing-with-curl.html
  • Helmut10001 3 hours ago
    I found out I can automate my 5,12kWh house battery through local-only RS485 connection, and directly setting registers using ModbusTCP from Home Assistant. I then drafted an automation with hysteresis and damping that tries to aim for Net-Zero export/import (pv surplus/grid). It appears to work!
    • isoprophlex 2 hours ago
      What brand/make of battery is that? I'm tentatively interested in home battery storage, but definitely not interested in shit that requires an app, an internet connection, and shitty saas spyware...
    • Gibbon1 2 hours ago
      The deranged thing about RS485 and modbus is it's old cheap and just works.
  • squidgyhead 2 hours ago
    I am cleaning up some pointer arithmetic stuff for multi-dimensional C style arrays. I managed to replace the code with a std::inner_product minus a std::accumulate (to accomodate for the fact that the upper array bound is exclusive, ie one-past-the-end).
  • scaramouche5 1 hour ago
    I found out that killer whales hunt and kill great white sharks. https://www.nationalgeographic.com/animals/article/orcas-spo...
  • solomonb 2 hours ago
    That its impossible to find an oil can with a zerk fitting. I need one for my bridgeport that uses zerks for oil and not grease.
  • hahahahhaah 25 minutes ago
    Go:

        r, err:= fn()
    
    Compiles if r is already declared. Creates a new lexical scope that has no access to the outer r. So the outer r doesn't get set. And I get a bug!
  • netghost 1 hour ago
    I found out that the guy who broke the thing I was working on was… me.
  • vishalontheline 2 hours ago
    Today I recorded myself skateboarding and found out that I don't move nearly as much as I think I do! No wonder I'm going so slow!
  • tejtm 1 hour ago
    replaced the broken spring on an ABANA style treadle hammer.

    breaking it in the first place was more fun

  • LunicLynx 1 hour ago
    I found git worktree today.
  • cookiengineer 2 hours ago
    I've read the adverserial attack paper, and I'm currently implementing a captcha based on images that have masks on them so that any LLM agent with a visual model will classify it wrong.

    The idea is to use something like a slider that shows different images combined with a memory task, like "find out the pair of images" and then offer maybe a text input field where the user has to write 1,2,3 or something similar with the image numbers to pass the captcha.

    The tldr is that I'm abusing the famous panda image that's classified as a gibbon as a technique to build a bot captcha.

    • willvarfar 1 hour ago
      crazy to think that soon not being able to successfully complete the captcha will be a signal that the user is human
  • GrowingSideways 3 hours ago
    I've been trying to research drone navigation tech from what we have learned so far from the russian/ukraine war. I'm very much not a hardware guy but software by itself has been feeling kind of useless or even crueler than usual.
  • StanislavPetrov 2 hours ago
    I found out that reading 900 wpm and actually comprehending what you are reading is actually possible and not that difficult at all.
  • stackghost 2 hours ago
    I found out it's easy to write Swift/Appkit apps without the dumpster fire that is Xcode! It turns out it's really easy to do it with good old `make`.
    • kristianp 17 minutes ago
      That sounds interesting. What reference did you use to get going?
  • german_dong 14 hours ago
    [flagged]