A tutorial like you have never seen before
12 by nassimsoftware | 7 comments on Hacker News.
Sunday, July 31, 2022
Saturday, July 30, 2022
New top story on Hacker News: Ask HN: Which re-entry/de-orbit was this?
Ask HN: Which re-entry/de-orbit was this?
26 by krmblg | 4 comments on Hacker News.
Hi HN! With the CZ5N re-entry happening I figured you could point me in the right direction to solve this mystery: On the evening of july 14, around 20:15 UTC we saw something pass over our heads fairly slowly (apparently stationary), leaving a greenish, sparkly line over the course of several minutes. It also left a long trail that apparently was still illuminated by the sun, originating at an azimuth of ~210° (SSW). Our observation position was ~48.08° N, 11.28° E (southern Germany, near Munich). About 20 minutes later I tried digging into it a little on James Darpinian's See A Satellite Tonight and found a rocket/booster stage that could have had a matching trajectory (CZ-4B R/B). I'd love to dig deeper into this, so: 1. Are there any websites where I can revisit that time/location? I'm aware of TLEs but would appreciate a "time-travel" view for the location in question 2. The CZ-4B R/B still seems to be „around“. Is it likely that we saw re-entry of only smaller parts of it that were just low enough to "hit" a substantial amount of atmosphere? 3. Are there other explanations for a slow-moving object leaving a trail creating greenish, sparkly lines? 4. What additional information would be needed to figure out what happened? Any help is much appreciated!
26 by krmblg | 4 comments on Hacker News.
Hi HN! With the CZ5N re-entry happening I figured you could point me in the right direction to solve this mystery: On the evening of july 14, around 20:15 UTC we saw something pass over our heads fairly slowly (apparently stationary), leaving a greenish, sparkly line over the course of several minutes. It also left a long trail that apparently was still illuminated by the sun, originating at an azimuth of ~210° (SSW). Our observation position was ~48.08° N, 11.28° E (southern Germany, near Munich). About 20 minutes later I tried digging into it a little on James Darpinian's See A Satellite Tonight and found a rocket/booster stage that could have had a matching trajectory (CZ-4B R/B). I'd love to dig deeper into this, so: 1. Are there any websites where I can revisit that time/location? I'm aware of TLEs but would appreciate a "time-travel" view for the location in question 2. The CZ-4B R/B still seems to be „around“. Is it likely that we saw re-entry of only smaller parts of it that were just low enough to "hit" a substantial amount of atmosphere? 3. Are there other explanations for a slow-moving object leaving a trail creating greenish, sparkly lines? 4. What additional information would be needed to figure out what happened? Any help is much appreciated!
Friday, July 29, 2022
Thursday, July 28, 2022
Wednesday, July 27, 2022
New top story on Hacker News: Show HN: Peerdiem — Discover and discuss one painting a day
Show HN: Peerdiem — Discover and discuss one painting a day
16 by afkqs | 6 comments on Hacker News.
Hi everyone, I made Peerdiem (a portmanteau word between Peer and Per Diem, which means Per Day in latin). The idea is very simple, a new painting or artwork to discover and discuss with your peers every day. Content is currently only fetched from Chicago Art Institute Free API [1] but I'm planning to add more sources in the short future. It was built with a couple of technologies I wanted to try for some time. Frontend is made with Preact and styled with Tailwindcss. Backend consists of an FastAPI app deployed in a Docker container. [1] https://ift.tt/fPCyER0
16 by afkqs | 6 comments on Hacker News.
Hi everyone, I made Peerdiem (a portmanteau word between Peer and Per Diem, which means Per Day in latin). The idea is very simple, a new painting or artwork to discover and discuss with your peers every day. Content is currently only fetched from Chicago Art Institute Free API [1] but I'm planning to add more sources in the short future. It was built with a couple of technologies I wanted to try for some time. Frontend is made with Preact and styled with Tailwindcss. Backend consists of an FastAPI app deployed in a Docker container. [1] https://ift.tt/fPCyER0
Tuesday, July 26, 2022
Monday, July 25, 2022
New top story on Hacker News: Show HN: Pipes puzzle (a.k.a. Net) on a hexagonal grid
Show HN: Pipes puzzle (a.k.a. Net) on a hexagonal grid
18 by gereleth | 8 comments on Hacker News.
Hello, HN - I wanted to share this puzzle game I made during my vacation. I'm rather fond of the pipes puzzle where your goal is to restore a scrambled network of connections by rotating tiles. It's usually played on a grid of squares and this all started when I decided to make a programmatic solver for that kind of puzzle. Then I realized that with some minor changes the solver could generate new puzzle instances. I thought about what kind of puzzle to make and someone suggested a hexagonal grid. Adapting the generator wasn't too hard but then I had to create a way to play this variant. So I did just that =). I find hexagonal pipes a bit more difficult than the square variant because there's a larger variety of possible tile shapes. For an extra challenge I implemented wrap mode where the board can connect to itself (right to left and top to bottom), so there are no convenient outer walls to start from. The site is made with Svelte Kit, its code is available on github at < https://github.com/gereleth/hexapipes >. Hope you enjoy playing =).
18 by gereleth | 8 comments on Hacker News.
Hello, HN - I wanted to share this puzzle game I made during my vacation. I'm rather fond of the pipes puzzle where your goal is to restore a scrambled network of connections by rotating tiles. It's usually played on a grid of squares and this all started when I decided to make a programmatic solver for that kind of puzzle. Then I realized that with some minor changes the solver could generate new puzzle instances. I thought about what kind of puzzle to make and someone suggested a hexagonal grid. Adapting the generator wasn't too hard but then I had to create a way to play this variant. So I did just that =). I find hexagonal pipes a bit more difficult than the square variant because there's a larger variety of possible tile shapes. For an extra challenge I implemented wrap mode where the board can connect to itself (right to left and top to bottom), so there are no convenient outer walls to start from. The site is made with Svelte Kit, its code is available on github at < https://github.com/gereleth/hexapipes >. Hope you enjoy playing =).
Sunday, July 24, 2022
Saturday, July 23, 2022
Friday, July 22, 2022
Thursday, July 21, 2022
Wednesday, July 20, 2022
Tuesday, July 19, 2022
Monday, July 18, 2022
New top story on Hacker News: Show HN: Babble – Communicate privately on state-sponsored social media
Show HN: Babble – Communicate privately on state-sponsored social media
15 by yvbbrjdr | 1 comments on Hacker News.
Thanks for checking out Babble! You might wonder why this app is even useful and why not just use Signal/PGP. This app's target audience is actually ordinary people in China or similar countries who are under severe government surveillance and censorship, where access to Signal and similar E2EE messaging software is blocked by nationwide firewalls, such as the Great Firewall of China (GFW). Chinese people have been deprived of freedom of speech even before the COVID-19 pandemic. Li Wenliang, who was among the first to notice the spread of the virus and warned his colleagues about it in a private WeChat group, was admonished by the police for "spreading rumors"; his punishment was then aired on the national TV channel. After Wenliang passed away due to getting COVID-19 himself, discussions about it on China's public Internet were highly restricted; most discussions will be deleted upon being posted, which was done by some automatic keyword detection mechanism. Things got even worse over the years and especially during the Shanghai lockdown in early 2022. Everything related to questioning the public health policy is banned. Many people posted articles about how bad Shanghai's economic and social situation is on their WeChat public accounts. None of these articles, not even their accounts, can survive for longer than a few hours. Even articles crying for help, because people were starving, got deleted. A video called Voice from Shanghai Lockdown ( https://youtu.be/38_thLXNHY8 ), which contains audio recordings of desperate Shanghai people during the lockdown, went viral on Chinese social media at the end of this April. Unsurprisingly, this video was immediately censored. People got angry and tried to spread this video as much as possible by re-posting it again and again, racing against the detection algorithm. But it was futile. It's just like 1984, where the number of words available to say "legally" is decreasing. There are no tools available for people to speak out. Public social media and private messaging apps are all monitored by the government. Foreign tools such as Telegram, Signal, or anything similar are blocked by the GFW. PGP is too technical for normal people. The goal of Babble is to provide those people with a cryptographic and steganographic tool that's easy enough to use but secure enough against a censorship system. It's not perfect as of now, but we are making an effort to make it better. Yes, Babble might get removed from the App Store in China if the Chinese government asks, but it's fundamentally different from Signal being blocked - there are a considerable number of people in China who has an overseas Apple ID so that they can download apps not on Chinese App Store, but to use Signal, you have to bypass GFW, which fewer people know how to. One of the real challenges for this project though, is how to get people aware of the situation, because our education is brainwashing and people are starting to take surveillance and censorship for granted. And it's very hard for the app to reach its intended audience because the surveillance system is designed to prevent them from accessing this kind of tool.
15 by yvbbrjdr | 1 comments on Hacker News.
Thanks for checking out Babble! You might wonder why this app is even useful and why not just use Signal/PGP. This app's target audience is actually ordinary people in China or similar countries who are under severe government surveillance and censorship, where access to Signal and similar E2EE messaging software is blocked by nationwide firewalls, such as the Great Firewall of China (GFW). Chinese people have been deprived of freedom of speech even before the COVID-19 pandemic. Li Wenliang, who was among the first to notice the spread of the virus and warned his colleagues about it in a private WeChat group, was admonished by the police for "spreading rumors"; his punishment was then aired on the national TV channel. After Wenliang passed away due to getting COVID-19 himself, discussions about it on China's public Internet were highly restricted; most discussions will be deleted upon being posted, which was done by some automatic keyword detection mechanism. Things got even worse over the years and especially during the Shanghai lockdown in early 2022. Everything related to questioning the public health policy is banned. Many people posted articles about how bad Shanghai's economic and social situation is on their WeChat public accounts. None of these articles, not even their accounts, can survive for longer than a few hours. Even articles crying for help, because people were starving, got deleted. A video called Voice from Shanghai Lockdown ( https://youtu.be/38_thLXNHY8 ), which contains audio recordings of desperate Shanghai people during the lockdown, went viral on Chinese social media at the end of this April. Unsurprisingly, this video was immediately censored. People got angry and tried to spread this video as much as possible by re-posting it again and again, racing against the detection algorithm. But it was futile. It's just like 1984, where the number of words available to say "legally" is decreasing. There are no tools available for people to speak out. Public social media and private messaging apps are all monitored by the government. Foreign tools such as Telegram, Signal, or anything similar are blocked by the GFW. PGP is too technical for normal people. The goal of Babble is to provide those people with a cryptographic and steganographic tool that's easy enough to use but secure enough against a censorship system. It's not perfect as of now, but we are making an effort to make it better. Yes, Babble might get removed from the App Store in China if the Chinese government asks, but it's fundamentally different from Signal being blocked - there are a considerable number of people in China who has an overseas Apple ID so that they can download apps not on Chinese App Store, but to use Signal, you have to bypass GFW, which fewer people know how to. One of the real challenges for this project though, is how to get people aware of the situation, because our education is brainwashing and people are starting to take surveillance and censorship for granted. And it's very hard for the app to reach its intended audience because the surveillance system is designed to prevent them from accessing this kind of tool.
Sunday, July 17, 2022
Saturday, July 16, 2022
Friday, July 15, 2022
New top story on Hacker News: Show HN: Eesel – Federated search without API integrations
Show HN: Eesel – Federated search without API integrations
7 by amoghs | 0 comments on Hacker News.
Hey there! Amogh here from eesel ( https://eesel.app ). eesel filters your browser history to show the docs you need for work, right in your new tab. You can see recent docs, filter by app or search by title or content. We're trying to solve a pretty universal problem. Everyone's work is spread across apps - there's a project brief in Google Docs, issues in Jira, a mockup in Figma, PRs in GitHub - and with this kind of sprawl, it can be a game of trial and error to find the links we need to do our job. Trying keywords in the address bar only works if we remember the title and it's specific enough, search in apps can be slow and noisy, company "knowledge hubs" in Confluence or Google Drive are usually not up to date, and we ultimately just ping each other on Slack to find things. I was struggling with this acutely as a PM at Intercom, and it felt ridiculous that I could search the web faster than my company's docs. It was around this time that I also discovered an Effective Altruism blog post on Operations ( https://ift.tt/fiHbAgM ) and how "maximising the productivity of others in the organisation" can have this multiplier effect for your own impact. That's when it clicked - here's an "operations" problem that felt tractable for my skills and I could potentially multiply my impact by solving it. This is what gave the conviction to prototype something on the weekends, and things spun off from there. Let's talk about the solution more. The magical thing about eesel is that we don't use APIs. When it comes to "search across apps", integrating with different APIs is a pretty default way to approach things. That's how we started, but things felt uneasy - could we really build API integrations with _everything_? There's so much out there, and this list is pretty much always changing. If we really did want a search across all work apps, we'd have to play catch up with old and new APIs. You could argue that these were just the schleps ( https://ift.tt/wi9lV1T ) we had to overcome, but it was amidst this we realised that uh, the browser exists. We mostly work in the browser, and the great thing about it is that it's built on web standards. From HTTP and URLs to HTML and CSS, all apps in the browser follow the same predictable patterns: documents are accessed via URLs, content lives inside the HTML, there's a page title, there's a favicon, and so on. It's not a perfect replacement for APIs, but it felt good enough. We didn't need to manually integrate with each app, and could instead rely on existing web standards. And that's what we did. eesel works with any app in the browser, including apps without APIs (like that internal company tool), or apps that don't exist yet (the new Product Hunt hit). Not using APIs also meant that we could go an extra step with privacy - eesel works fully locally by default and you don't need to login to _anything_ (even eesel!). Simply install and it works. We want to keep building on this approach and improve how we work in the browser. For instance, eesel uses keywords to automatically organise pages into Folders, and there's Commands to take actions (spoiler: you can customise a JavaScript to inject on a page, like this script that goes to a Notion backlog and clicks the "New" button - https://ift.tt/UB5h3jt... ). Alright, that's a lot of writing from us. We have a bunch of ideas, and would love to hear about where you think we should take this next.
7 by amoghs | 0 comments on Hacker News.
Hey there! Amogh here from eesel ( https://eesel.app ). eesel filters your browser history to show the docs you need for work, right in your new tab. You can see recent docs, filter by app or search by title or content. We're trying to solve a pretty universal problem. Everyone's work is spread across apps - there's a project brief in Google Docs, issues in Jira, a mockup in Figma, PRs in GitHub - and with this kind of sprawl, it can be a game of trial and error to find the links we need to do our job. Trying keywords in the address bar only works if we remember the title and it's specific enough, search in apps can be slow and noisy, company "knowledge hubs" in Confluence or Google Drive are usually not up to date, and we ultimately just ping each other on Slack to find things. I was struggling with this acutely as a PM at Intercom, and it felt ridiculous that I could search the web faster than my company's docs. It was around this time that I also discovered an Effective Altruism blog post on Operations ( https://ift.tt/fiHbAgM ) and how "maximising the productivity of others in the organisation" can have this multiplier effect for your own impact. That's when it clicked - here's an "operations" problem that felt tractable for my skills and I could potentially multiply my impact by solving it. This is what gave the conviction to prototype something on the weekends, and things spun off from there. Let's talk about the solution more. The magical thing about eesel is that we don't use APIs. When it comes to "search across apps", integrating with different APIs is a pretty default way to approach things. That's how we started, but things felt uneasy - could we really build API integrations with _everything_? There's so much out there, and this list is pretty much always changing. If we really did want a search across all work apps, we'd have to play catch up with old and new APIs. You could argue that these were just the schleps ( https://ift.tt/wi9lV1T ) we had to overcome, but it was amidst this we realised that uh, the browser exists. We mostly work in the browser, and the great thing about it is that it's built on web standards. From HTTP and URLs to HTML and CSS, all apps in the browser follow the same predictable patterns: documents are accessed via URLs, content lives inside the HTML, there's a page title, there's a favicon, and so on. It's not a perfect replacement for APIs, but it felt good enough. We didn't need to manually integrate with each app, and could instead rely on existing web standards. And that's what we did. eesel works with any app in the browser, including apps without APIs (like that internal company tool), or apps that don't exist yet (the new Product Hunt hit). Not using APIs also meant that we could go an extra step with privacy - eesel works fully locally by default and you don't need to login to _anything_ (even eesel!). Simply install and it works. We want to keep building on this approach and improve how we work in the browser. For instance, eesel uses keywords to automatically organise pages into Folders, and there's Commands to take actions (spoiler: you can customise a JavaScript to inject on a page, like this script that goes to a Notion backlog and clicks the "New" button - https://ift.tt/UB5h3jt... ). Alright, that's a lot of writing from us. We have a bunch of ideas, and would love to hear about where you think we should take this next.
Thursday, July 14, 2022
Wednesday, July 13, 2022
New top story on Hacker News: Expanding the Tau VM family with Arm-based processors
Expanding the Tau VM family with Arm-based processors
28 by ashvardanian | 0 comments on Hacker News.
28 by ashvardanian | 0 comments on Hacker News.
Tuesday, July 12, 2022
Monday, July 11, 2022
New top story on Hacker News: Postgres Full-Text Search: A Search Engine in a Database
Postgres Full-Text Search: A Search Engine in a Database
42 by craigkerstiens | 11 comments on Hacker News.
42 by craigkerstiens | 11 comments on Hacker News.
New top story on Hacker News: €1.00 = $1.00, The Euro sinks to lowest since 2002
€1.00 = $1.00, The Euro sinks to lowest since 2002
126 by systemvoltage | 103 comments on Hacker News.
126 by systemvoltage | 103 comments on Hacker News.
Sunday, July 10, 2022
New top story on Hacker News: Show HN: Evryca – fractal thinking tool to brainstorm and organize thoughts
Show HN: Evryca – fractal thinking tool to brainstorm and organize thoughts
5 by efojs | 0 comments on Hacker News.
Made a tool to organize thoughts. Actually it is a mind tree, but in a more web-friendly form. It has pivoted from what I originally started building at evryca.com. Some years ago I got the idea of fractal conversation, instead of old-school tree/ladder-like comments. I wanted to see only comments related to the current level. I started making "something" with fractal comments. This "something" was a project discussion platform. But it turned out that even I myself don't use it, and the idea of fractal comments stuck there unused. And recently it dawned on me that it may be a conversation with yourself — thinking, brainstorming, taking notes, writing. So made this kind of cork/whiteboard, where one can dive into the subject and, being in the flow, write and see only related notes and rearrange them later. I'm trying to make it flawless and add keyboard shortcuts where it's possible (Ctr+Enter to submit idea, drag-and-drop to rearrange, Esc to jump level up). So finally I've made a tool that I use myself and will update it gradually (sorting, touch devices, ex/import (json, text), boards, more navigation with keyboard and other stuff, and login).
5 by efojs | 0 comments on Hacker News.
Made a tool to organize thoughts. Actually it is a mind tree, but in a more web-friendly form. It has pivoted from what I originally started building at evryca.com. Some years ago I got the idea of fractal conversation, instead of old-school tree/ladder-like comments. I wanted to see only comments related to the current level. I started making "something" with fractal comments. This "something" was a project discussion platform. But it turned out that even I myself don't use it, and the idea of fractal comments stuck there unused. And recently it dawned on me that it may be a conversation with yourself — thinking, brainstorming, taking notes, writing. So made this kind of cork/whiteboard, where one can dive into the subject and, being in the flow, write and see only related notes and rearrange them later. I'm trying to make it flawless and add keyboard shortcuts where it's possible (Ctr+Enter to submit idea, drag-and-drop to rearrange, Esc to jump level up). So finally I've made a tool that I use myself and will update it gradually (sorting, touch devices, ex/import (json, text), boards, more navigation with keyboard and other stuff, and login).
Saturday, July 9, 2022
Friday, July 8, 2022
Thursday, July 7, 2022
Wednesday, July 6, 2022
New top story on Hacker News: Show HN: C3 – A C alternative that looks like C
Show HN: C3 – A C alternative that looks like C
18 by lerno | 2 comments on Hacker News.
Compiler link: https://ift.tt/H4FPAOc Docs: http://www.c3-lang.org This is my follow-up "Show HN" from roughly a year ago ( https://ift.tt/8GpvDru ). Since then the language design has evolved and the compiler has gotten much more solid. Assorted extra info: - The C3 name is a homage to the C2 language project ( http://c2lang.org ) which it was originally inspired by. - Although C3 mostly conforms to C syntax, the most obvious change is requiring `fn` in front of the functions. This is to simplify searching for definitions in editors. - There is a comparison with some other languages here: https://ift.tt/BQKip9Z - The parts in C3 which breaks C semantics or syntax: https://ift.tt/ytME0Xk - Aside from the very C-like syntax, one the biggest difference between C3 and other "C competitors" is that C3 prioritizes C ABI compatibility, so that all C3 special types (such as slices and optionals) can be used from C without any effort. C and C3 can coexist nicely in a code base. - Currently the standard library is not even alpha quality, it's actively being built, but there is a `libc` module which allows accessing all of libc. Raylib is available to use from C3 with MacOS and Windows, see: https://ift.tt/yBNZLH3 - There is a blog with assorted articles I've written during the development: https://ift.tt/Fzm2q8H
18 by lerno | 2 comments on Hacker News.
Compiler link: https://ift.tt/H4FPAOc Docs: http://www.c3-lang.org This is my follow-up "Show HN" from roughly a year ago ( https://ift.tt/8GpvDru ). Since then the language design has evolved and the compiler has gotten much more solid. Assorted extra info: - The C3 name is a homage to the C2 language project ( http://c2lang.org ) which it was originally inspired by. - Although C3 mostly conforms to C syntax, the most obvious change is requiring `fn` in front of the functions. This is to simplify searching for definitions in editors. - There is a comparison with some other languages here: https://ift.tt/BQKip9Z - The parts in C3 which breaks C semantics or syntax: https://ift.tt/ytME0Xk - Aside from the very C-like syntax, one the biggest difference between C3 and other "C competitors" is that C3 prioritizes C ABI compatibility, so that all C3 special types (such as slices and optionals) can be used from C without any effort. C and C3 can coexist nicely in a code base. - Currently the standard library is not even alpha quality, it's actively being built, but there is a `libc` module which allows accessing all of libc. Raylib is available to use from C3 with MacOS and Windows, see: https://ift.tt/yBNZLH3 - There is a blog with assorted articles I've written during the development: https://ift.tt/Fzm2q8H
Tuesday, July 5, 2022
Monday, July 4, 2022
Sunday, July 3, 2022
New top story on Hacker News: Show HN: Desklamp – convenient and collaborative notemaking on PDFs
Show HN: Desklamp – convenient and collaborative notemaking on PDFs
14 by pj747 | 3 comments on Hacker News.
Hey HN! I'm Prajwal, the co-creator of Desklamp! I just completed my undergrad, which is where we got the idea for Desklamp. A bunch of friends and I built this because we hated the experience of studying on our laptops. It was boring, and we found ourselves staring at the screen for hours on end with no output to show for it. To make reading more engaging and to make sure we could remember what we read, we built a note-making system integrated with a PDF reader. The aim is to encourage you to make notes! LaTeX support, clipping out sections from the document, linking notes to sections in the PDF - everything is designed to really make sure you have no excuse to not make notes as you read. We've also added a lot of fixes for minor inconveniences (scrolling across sections, hitting the wrong page number, light mode, viewing your highlights at a glance). And all of this is collaborative, because that just makes notes even more useful. It's free for a while - we want to know what the rest of you think! Feedback can only help us make this even better. It's available as a web-app and a desktop app for Mac and Windows (Linux users, mail us, we're operating on a very closed beta right now).
14 by pj747 | 3 comments on Hacker News.
Hey HN! I'm Prajwal, the co-creator of Desklamp! I just completed my undergrad, which is where we got the idea for Desklamp. A bunch of friends and I built this because we hated the experience of studying on our laptops. It was boring, and we found ourselves staring at the screen for hours on end with no output to show for it. To make reading more engaging and to make sure we could remember what we read, we built a note-making system integrated with a PDF reader. The aim is to encourage you to make notes! LaTeX support, clipping out sections from the document, linking notes to sections in the PDF - everything is designed to really make sure you have no excuse to not make notes as you read. We've also added a lot of fixes for minor inconveniences (scrolling across sections, hitting the wrong page number, light mode, viewing your highlights at a glance). And all of this is collaborative, because that just makes notes even more useful. It's free for a while - we want to know what the rest of you think! Feedback can only help us make this even better. It's available as a web-app and a desktop app for Mac and Windows (Linux users, mail us, we're operating on a very closed beta right now).
Saturday, July 2, 2022
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