New year, new Edge of Emulation article! This one is about the Glucoboy, a GBA cartridge that doubles as a blood glucose meter.
https://shonumi.github.io/articles/art33.html
For years, this cartridge was one the rarest pieces of Game Boy hardware out there. It was only last year that the Video Game History Foundation managed to dump the ROM.
Now you can emulate the Glucoboy without any actual blood!