Glasses wearers, try a little experiment. Take off your glasses and look at this page or, at least, at something you can’t see well without your glasses. Now imagine if …read more (https://hackaday.com/2021/11/16/tech-in-plain-sight-eyeglasses/)

3D Printed Marble Music Machine Looking Good Already
https://hackaday.com/2021/11/16/3d-printed-marble-music-machine-looking-good-already/

https://www.youtube.com/watch?v=6uTZwiOGUgo
" data-image-caption="" data-medium-file="https://hackaday.com/wp-content/uploads/2021/11/Snap-2021-11-14-at-17.19.33.png?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2021/11/Snap-2021-11-14-at-17.19.33.png?w=800">Inspired by the enormous marble music machines from the staggeringly talented [Wintergatan] and the marble run builds by [Daniel de Bruin], [Ivan Miranda] has been busy again building a largely …read more (https://hackaday.com/2021/11/16/3d-printed-marble-music-machine-looking-good-already/)

Microplastics Are Everywhere: Land, Sea and Air
https://hackaday.com/2021/11/16/microplastics-are-everywhere-land-sea-and-air/

Plastics took off in the 20th century, with the new class of materials finding all manner of applications that metal, wood and paper simply couldn’t deliver on. Every field from …read more (https://hackaday.com/2021/11/16/microplastics-are-everywhere-land-sea-and-air/)

Binaural Hearing Modeled with an Arduino
https://hackaday.com/2021/11/16/binaural-hearing-modeled-with-an-arduino/

You don’t have two ears by accident. [Stoppi] has a great post about this, along with a video you can see below. (The text is in German, but that’s what …read more (https://hackaday.com/2021/11/16/binaural-hearing-modeled-with-an-arduino/)

Jigglypuff Sensor Breathes CO2 So You Don’t Have To
https://hackaday.com/2021/11/16/jigglypuff-sensor-breathes-co2-so-you-dont-have-to/

We’ve seen a lot of environmental monitoring projects here at Hackaday. Seriously, a lot. They usually take the form of a microcontroller, a couple sensors, and maybe a 3D printed …read more (https://hackaday.com/2021/11/16/jigglypuff-sensor-breathes-co2-so-you-dont-have-to/)

Quick and (Not Very) Dirty Negative Voltage Supply
https://hackaday.com/2021/11/16/quick-and-not-very-dirty-negative-voltage-supply/

There comes a time in every hardware hacker’s career during which they first realize they need a negative voltage rail in their project. There also comes a time, usually ~10ms …read more (https://hackaday.com/2021/11/16/quick-and-not-very-dirty-negative-voltage-supply/)

Hacking Multiplication with Karatsuba’s Algorithm
https://hackaday.com/2021/11/16/hacking-multiplication-with-karatsubas-algorithm/

People tend to obsess over making computer software faster. You can, of course, just crank up the clock speed and add more processors, but often the most powerful way to …read more (https://hackaday.com/2021/11/16/hacking-multiplication-with-karatsubas-algorithm/)