When Hacking and Biosensing Collide
https://hackaday.com/2021/12/24/when-hacking-and-biosensing-collide/

[Prof. Edwin Hwu] of the Technical University of Denmark wrote in with a call for contributions to special edition of the open-access scientific journal Biosensors. Along the way, he linked …read more (https://hackaday.com/2021/12/24/when-hacking-and-biosensing-collide/)

Tiny 3D Printed Magnets Show Patterns
https://hackaday.com/2021/12/24/tiny-3d-printed-magnets-show-patterns/

You normally associate a double helix with DNA, but an international team headquartered at Cambridge University used 3D printing to create magnetic double helixes that are about a 1,000 times …read more (https://hackaday.com/2021/12/24/tiny-3d-printed-magnets-show-patterns/)

A CMOS Ring Modulator Pedal
https://hackaday.com/2021/12/24/a-cmos-ring-modulator-pedal/

Earlier this year, we featured an unusual radio receiver that took the very traditional superhetrodyne design and implemented it in an unexpected fashion without any inductors, using instead a combination …read more (https://hackaday.com/2021/12/24/a-cmos-ring-modulator-pedal/)

Hacking Film Processing with Coffee
https://hackaday.com/2021/12/24/hacking-film-processing-with-coffee/

Years ago, doing your own darkroom work was the only way to really control what your pictures looked like. In those days, coffee was what kept you going while you …read more (https://hackaday.com/2021/12/24/hacking-film-processing-with-coffee/)

Do You Need a Cycloidal Drive?
https://hackaday.com/2021/12/25/do-you-need-a-cycloidal-drive/

A cycloidal gear drive is one of the most mesmerizing reduction gears to watch when it is running, but it’s not all just eye-candy. Cycloidals give decent gearing, are relatively …read more (https://hackaday.com/2021/12/25/do-you-need-a-cycloidal-drive/)

3D Prints With A Mirror Finish
https://hackaday.com/2021/12/25/3d-prints-with-a-mirror-finish/

As anyone who has used a 3D printer before knows, what comes off the bed of your regular FSD printer is by no means a mirror finish. There are layers …read more (https://hackaday.com/2021/12/25/3d-prints-with-a-mirror-finish/)

Blender? No, Grinder
https://hackaday.com/2021/12/25/blender-no-grinder/

[Leandro Felipe] is no stranger to the dirty hack, and this video of his conversion of a blender into a handheld rotary grinding tool is no exception. (Embedded below.) But …read more (https://hackaday.com/2021/12/25/blender-no-grinder/)

Mini Linear Actuators From DVD Drive Parts
https://hackaday.com/2021/12/25/mini-linear-actuators-from-dvd-drive-parts/