After receiving a vaccination shot, it’s likely that we’ll feel some side-effects. These can range from merely a sore arm to swollen lymph nodes and even a fever. Which side-effects …read more (https://hackaday.com/2021/09/21/mechanisms-behind-vaccine-side-effects-the-science-that-causes-that-sore-arm/)

Toilet-Training Cows is No Bull
https://hackaday.com/2021/09/21/toilet-training-cows-is-no-bull/

Human activity may be the main cause of climate change, but all these cows milling and mooing about don’t help, either. Everyone knows that cows produce methane-laden flatulence, but there’s …read more (https://hackaday.com/2021/09/21/toilet-training-cows-is-no-bull/)

Keebin’ with Kristina: the One with the Grabbity Gloves
https://hackaday.com/2021/09/21/keebin-with-kristina-the-one-with-the-grabbity-gloves/

I keep saying I need to stay away from auction sites, but then I wouldn’t have as much fodder for Hackaday, would I? As I write this, I’m waiting on …read more (https://hackaday.com/2021/09/21/keebin-with-kristina-the-one-with-the-grabbity-gloves/)

Bringing the Quake Flicker to Life with a Hacked Light
https://hackaday.com/2021/09/21/bringing-the-quake-flicker-to-life-with-a-hacked-light/

If you ever feel a pang of shame because you’ve been reusing the same snippets of code in your projects for years, don’t. Even the big names do it, as …read more (https://hackaday.com/2021/09/21/bringing-the-quake-flicker-to-life-with-a-hacked-light/)

Mini Wireless Thermal Printers Get Arduino Library (and MacOS App)
https://hackaday.com/2021/09/21/mini-wireless-thermal-printers-get-arduino-library-and-macos-app/

[Larry Bank]’s Arduino library to print text and graphics on BLE (Bluetooth Low Energy) thermal printers has some excellent features, and makes sending wireless print jobs to a number of …read more (https://hackaday.com/2021/09/21/mini-wireless-thermal-printers-get-arduino-library-and-macos-app/)

Cooking Up a Batch of Homebrew Welding Gas
https://hackaday.com/2021/09/21/cooking-up-a-batch-of-homebrew-welding-gas/

You know the feeling — you’re making good progress on a weekend project, you’re really in the groove, things are going right. Right up until you run out of That …read more (https://hackaday.com/2021/09/21/cooking-up-a-batch-of-homebrew-welding-gas/)

Spooky Coffin Bell Spooks Passers By on Halloween
https://hackaday.com/2021/09/21/spooky-coffin-bell-spooks-passers-by-on-halloween/

Being buried alive isn’t fun, we imagine. Fear of it led to the development of various safety coffin ideas in the 18th and 19th centuries, and [Glen Akins] wonderful Halloween …read more (https://hackaday.com/2021/09/21/spooky-coffin-bell-spooks-passers-by-on-halloween/)

Retro TV Shows off Family Memories with Raspberry Pi
https://hackaday.com/2021/09/21/retro-tv-shows-off-family-memories-with-raspberry-pi/