Emergency Bolt-Action Launcher for EpiPens
Imagine you and your friend are enjoying a nice sunny day, and BAM — they start to have a severe allergic reaction to who knows what. You have an EpiPen, 
Imagine you and your friend are enjoying a nice sunny day, and BAM — they start to have a severe allergic reaction to who knows what. You have an EpiPen, Hackaday
Emergency Bolt-Action Launcher For EpiPens
Imagine you and your friend are enjoying a nice sunny day, and BAM — they start to have a severe allergic reaction to who knows what. You hav...
Hackaday
Emergency Bolt-Action Launcher For EpiPens
Imagine you and your friend are enjoying a nice sunny day, and BAM — they start to have a severe allergic reaction to who knows what. You hav...
![image](https://hackaday.com/wp-content/uploads/2016/05/microphone.jpg?w=800")
alt=""/>Join Hackaday Editors Elliot Williams and Tom Nardi as they cover their favorite hacks and stories from the week. The episode kicks off with some updates about Hackaday Europe and ![image](https://hackaday.com/wp-content/uploads/2026/03/aa_battery_powered_pc_second_try_scuffedbits_youtube.jpg?w=800")
alt=""/>After the previous attempt of running a PC off AA cells got a lot of comments, [ScuffedBits] decided to do the scientifically responsible thing and re-ran the experiment with all 
![image](https://hackaday.com/wp-content/uploads/2016/01/darkarts.jpg?w=800")
alt=""/>When Friday the Thirteenth and Patch Tuesday happen on the same week, we’re surely in for a good time. Anyone who maintains any sort of Microsoft ecosystem knows by now 
![image](https://hackaday.com/wp-content/uploads/2026/03/arcaos-featured.jpg?w=800")
alt=""/>ArcaOS is an operating system you might not have heard of, but you will recognize it when we tell you that it’s the direct descendant of IBM’s OS/2. It’s just 
![image](https://hackaday.com/wp-content/uploads/2026/03/fruitbowl-feat.jpg?w=800")
alt=""/>Fruit bowls have an unavoidable annoyance– not flies and rotten fruit, those would be avoidable if your diet was better. No, it’s that the bowl is never the right size. 
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alt=""/>America knew it as the Nintendo Entertainment System, but in Japan, it was the Family Computer (Famicom). It was more than just a home console—it was intended to actually do 
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alt=""/>Last year, we brought you a story about the BhangmeterV2, an internet-of-things nuclear war monitor. With a cold-war-era HSN-1000 nuclear event detector at its heart, it had one job: announce 
![image](https://hackaday.com/wp-content/uploads/2026/03/I-Built-a-CT-Scanner-to-See-Sound-8-42-screenshot.png?w=800")
alt=""/>Sound! It’s a thing you hear, moreso than something you see with your eyes. And yet, it is possible to visualize sound with various techniques. [PlasmatronX] demonstrates this well, using ![image](https://hackaday.com/wp-content/uploads/2026/03/field-sequential-cbs.jpg?w=800")
alt=""/>The early history of colour TV had several false starts, of which perhaps one of the most interesting might-have-beens was the CBS field-sequential system. This was a rival to the 
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alt=""/>Classic Mac OS was prized for its clean, accessible GUI when it first hit the scene in the 1980s. Back then, developers hadn’t even conceived of all the weird gewgaws 
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alt=""/>While working on a project that involved super-thin prints, [Julius Curt] came up with selective ironing, a way to put designs on the top surface of a print without adding 
![image](https://hackaday.com/wp-content/uploads/2026/03/5106001773010796560_7fb03f-e1773288507424.jpg?w=800")
alt=""/>Phased-array radars are great for all sorts of things, whether you’re doing advanced radio research or piloting a fifth-generation combat aircraft. They’re also typically very expensive. [Nawfal] hopes to make 
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alt=""/>When building a radio transmitter, unless it’s a very small one indeed, there’s a need for an amplifier before the antenna. This is usually referred to as the power amplifier, 
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alt=""/>Ever since 3D printing has become a popular tool, the question of waste has been looming in the background. The sad reality of rapid prototyping is that you’re going to 
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alt=""/>Old-school diving helmets are deceivingly simple, even if they are – as [Hyperspace Pirate] puts it in a recent video – essentially the equivalent of an upside-down bucket with an 
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alt=""/>Cycloidal drives are a type of speed reducer that are significantly more compact than gearboxes, but they still come with a fair number of components. In comparison, the harmonic pin-ring 
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alt=""/>There was an ideal of convergence, a long time ago, when one device would be all you need, digitally speaking. [ETA Prime] on YouTube seems to think we’ve reached that 
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alt=""/>There’s a meme which may have a basis in truth, of a teenager left clueless when presented with a rotary telephone. The dial, in reality a mechanical pulse chain generator, 
![image](https://hackaday.com/wp-content/uploads/2019/08/Micrometeorites.jpg?w=800")
alt=""/>Sunday night, around 7:00 PM local time, a bright fireball streaked across the western German sky, exploded, and rained chunks of space rock down on the region around Koblenz. One 