We noted that Excel turned 40 this year. That makes it seem old, and today, if you say “spreadsheet,” there’s a good chance you are talking about an Excel spreadsheet, …read more (https://hackaday.com/2025/12/15/a-brief-history-of-the-spreadsheet/)

Tearing Down Walmart’s $12 Keychain Camera
https://hackaday.com/2025/12/15/tearing-down-walmarts-12-keychain-camera/

Keychain cameras are rarely good. However, in the case of Walmart’s current offering, it might be worse than it’s supposed to be. [FoxTailWhipz] bought the Vivitar-branded device and set about …read more (https://hackaday.com/2025/12/15/tearing-down-walmarts-12-keychain-camera/)

Pufferfish Venom Can Kill, Or It Can Relieve Pain
https://hackaday.com/2025/12/15/pufferfish-venom-can-kill-or-it-can-relieve-pain/

Illustrative image of a pufferfish, but not one of the poisonous ones.
" data-image-caption="" data-medium-file="https://hackaday.com/wp-content/uploads/2025/12/Puffer_Fish_DSC01257_featured.png?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2025/12/Puffer_Fish_DSC01257_featured.png?w=800">Tetrodotoxin (TTX) is best known as the neurotoxin of the puffer fish, though it also appears in a range of other marine species. You might remember it from an episode …read more (https://hackaday.com/2025/12/15/pufferfish-venom-can-kill-or-it-can-relieve-pain/)

3D Printing and Metal Casting are a Great Match
https://hackaday.com/2025/12/15/3d-printing-and-metal-casting-are-a-great-match/

[Chris Borge] has made (and revised) many of his own tools using a combination of 3D printing and common hardware, and recently decided to try metal casting. Having created his …read more (https://hackaday.com/2025/12/15/3d-printing-and-metal-casting-are-a-great-match/)

Giant Neopixel Is Just Like The Regular Kind, Only Bigger
https://hackaday.com/2025/12/15/giant-neopixel-is-just-like-the-regular-kind-only-bigger/

Neopixels and other forms of addressable LEDs have taken the maker world by storm. They make it trivial to add a ton of controllable, glowing LEDs to any project. [Arnov …read more (https://hackaday.com/2025/12/15/giant-neopixel-is-just-like-the-regular-kind-only-bigger/)

Plug Into USB, Read Hostname and IP Address
https://hackaday.com/2025/12/15/plug-into-usb-read-hostname-and-ip-address/

Ever wanted to just plug something in and conveniently read the hostname and IP addresses of a headless board like a Raspberry Pi? Chances are, a free USB port is more …read more (https://hackaday.com/2025/12/15/plug-into-usb-read-hostname-and-ip-address/)

Magnetic Transformer Secrets
https://hackaday.com/2025/12/15/magnetic-transformer-secrets/

[Sam Ben-Yaakov] has another lecture online that dives deep into the physics of electronic processes. This time, the subject is magnetic transformers. You probably know that the ratio of current …read more (https://hackaday.com/2025/12/15/magnetic-transformer-secrets/)