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Why do bees die when they sting you?
As Richard Feynman points out, every 'why' question in science needs to be treated with caution. This is because there are always several different levels at which a why problem can be answered, depending on what kind of response you're looking for.
Taking Feynman's illustrative example, if pizza ar...
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LoRa: Field Testing Antennas
LoRa: Field Testing Antennas
Learn about three different antennas carried by SparkFun, and determine which will suit your long-range needs!
Hello! Mariah back again with more content about LoRA. A few weeks before this blog post I posted a tutorial about how to set up a simple peer-to-peer network f...
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Converting a WW2-era Landing Gear and Flaps Indicator into a USB Peripheral
In this project, I convert a WW2-era landing gear and flaps indicator into a USB peripheral using a Raspberry Pi Pico development board and eight channels of programmable current sources. This project is similar to my WW2-era engine cowl flaps indicator project but the gear and flaps indicator requi...
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Creating aerial imagery with a bike helmet camera (GoPro) and OpenDroneMap - Jake Coppinger
See comments on Hacker News (24 comments, 220 points)
This technical guide details how you can create your own orthorectified (aka satellite view/bird mode) imagery, point clouds and 3D models of streets with nothing but a 360 degree camera mounted on bicycle helmet, and the open source photogrammet...
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Ten Minute Physics
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24 Bounding Volume Hierarchies with a balzing fast implementation
In this tutorial I explain how to use Morton codes to create a bounding volume hierarchy blazing fast.
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23 Broad phase collision detection with Sweep and Prune
In this tutorial I explain the Sweep and Prune method and present a...
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The story of VaccinateCA
Nobody had a plan to get vaccines out of freezers and into Americans’ arms–except VaccinateCA. Its CEO tells the story of how a small team brought order to a chaotic rollout.
The development of vaccines for Covid-19 was a world historical success. The rollout of the vaccines in the United States was...
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Ideas That Changed My Life
Ideas That Changed My Life
You spend years trying to learn new stuff but then look back and realize that maybe like 10 big ideas truly changed how you think and drive most of what you believe.
A few of mine:
Everyone belongs to a tribe and underestimates how influential that tribe is on their thinki...
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SQLforDevs.com - Next-Level Database Techniques for Developers Ebook
You don't know SQL. Aside from basic CRUD statements, you haven't used any advanced database features. This free ebook will share many recipes to make development faster by using a lot of stuff you probably never heard of.
Your Tech Stack has changed dramatically in the past 20 years: Some technolog...
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To infinity and beyond: enabling the future of GitHub's REST API with API versioning
To infinity and beyond: enabling the future of GitHub’s REST API with API versioning
We’re introducing calendar-based versioning for our REST API, so we can keep evolving our API, whilst still giving integrators a smooth migration path and plenty of time to update their integrations.
Millions of dev...
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FFmpeg - Ultimate Guide | IMG.LY Blog
In this guide, we'll go through the hot topics of FFmpeg. But before that, we'll cover some base ground to help you understand basic media concepts and FFmpeg. Feel free to skip the parts that are already trivial for you!
Introduction to FFmpeg
FFmpeg.org's definition is the following: "FFmpeg is th...
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40 Useful Concepts (Winter 2022)
I recently posted a new megathread to Twitter, and a couple of y’all asked me if I could republish it on this blog so it’s easier to read and reference. I’ve therefore posted it below, together with links for further reading.
One of you also asked me when my next article is going to be published. I’...
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Moving Object Detection using Frame Differencing with OpenCV
In this tutorial, you will learn how to detect moving objects in a video using the frame differencing technique. We will use the OpenCV computer vision library for this. In short, we will learn to carry out moving object detection using frame differencing with OpenCV.
We will be implementing the con...
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Ask HN: Why are Git submodules so bad?
I have been a git user for a long time, but I've never used Subversion or any other VCS more than a little.
I also hardly use Git submodules, but when I do, I don't struggle.
Yet people talk about Git submodules as though they are really hard. I presume I'm just not using them as much as other peopl...
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Ask HN: What's is your go to toolset for simple front end development?
I'm quite firmly in back end development. Often times I find myself wanting to have a simple front end to which I can attach some new experiments for home brew coding such as Flask.
I'd not mind if my front end looked a little bit nice, but don't want to spend forever learning, hand coding, and trou...
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Ask HN: What are some cool but obscure data structures you know about?
I'm very interested in what types of interesting data structures are out there HN. Totally your preference.
I'll start: bloom filters. Lets you test if a value is definitely NOT in a list of pre-stored values (or POSSIBLY in a list - with adjustable probability that influences storage of the values....
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SQLite is not a toy database (2021) (antonz.org)
I wish there was some sort of an Access-like form/app builder tool for quickly building GUIs around SQLite databases. That's the one thing I miss. I'd love to reach for SQLite instead of Excel or something.
We're maintaining a rapid dev solution for building Apps for SQLite + other popular RDBMS's a...
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Ask HN: In 2022, what is the proper way to get into machine/deep learning?
By getting into machine or deep learning I mean building upto a stage to do ML/DL research. Applied research or core theory of ML/DL research. Ofcourse, the path to both will quite different.
Standing in 2022, what are the best resources for a CS student/decent programmer to get into the field of ML...
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Docker Compose best practices for dev and prod (releasehub.com)
One thing I really like about profiles is that they get activated implicitly if you reference one of their services when running docker compose. So you can define development, debugging, or maintenance tools in your compose file and just run them with `docker compose run some-random-tool` without ha...
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Show HN: Devbox – Easy, predictable shells and containers (github.com/jetpack-io)
Devbox is a command-line tool that lets you easily create isolated shells and containers. You start by defining the list of packages required by your development environment, and devbox uses that definition to create an isolated environment just for your application.
In practice, Devbox works simila...
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Are GPUs Worth It for ML? (exafunction.com)
For some reason they focus on the inference, which is the computationally cheap part. If you're working on ML (as opposed to deploying someone else's ML) then almost all of your workload is training, not inference.
Agreed that there are workloads where inference is not expensive, but it's really wor...
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