Perhaps most readers will remember when they saw the first SpaceX demonstration of a rocket stage landing vertically on the pad under control. It’s something of a shock to be …read more (https://hackaday.com/2023/06/21/how-to-land-a-model-rocket-vertically/)

Fuel Cell Turns PET and Carbon Dioxide into Useful Chemicals
https://hackaday.com/2023/06/21/fuel-cell-turns-pet-and-carbon-dioxide-into-useful-chemicals/

The University of Cambridge has a novel fuel cell design that can grab CO2 from the atmosphere or industrial processes and, combined with waste PET plastic, provides syngas and glycolic …read more (https://hackaday.com/2023/06/21/fuel-cell-turns-pet-and-carbon-dioxide-into-useful-chemicals/)

In Praise of RPN (with Python or C)
https://hackaday.com/2023/06/21/in-praise-of-rpn-with-python-or-c/

HP calculators, slide rules, and Forth all have something in common: reverse polish notation or RPN. Admittedly, slide rules don’t really have RPN, but you work problems on them the …read more (https://hackaday.com/2023/06/21/in-praise-of-rpn-with-python-or-c/)

No Frills Autonomous Lawnmower Gets The Job Done
https://hackaday.com/2023/06/21/no-frills-autonomous-lawnmower-gets-the-job-done/

[Nathan] needed an autonomous mower to help on the farm, so he built his own without breaking the bank. It might not be the prettiest machine, but it’s been keeping …read more (https://hackaday.com/2023/06/21/no-frills-autonomous-lawnmower-gets-the-job-done/)

Congratulations to Our Op-Amp Challenge Winners!
https://hackaday.com/2023/06/21/congratulations-to-our-op-amp-challenge-winners/

The real world is analog, and the op-amp is the indispensable building block of many analog circuits. We wanted to give you analog fanatics out there a chance to shine …read more (https://hackaday.com/2023/06/21/congratulations-to-our-op-amp-challenge-winners/)

3D Printed Machine Shows How Braiding is Done
https://hackaday.com/2023/06/21/3d-printed-machine-shows-how-braiding-is-done/

If there’s something more fascinating than watching cleverly engineered industrial machines do their work, we don’t know what it could be. And at the top of that list has to …read more (https://hackaday.com/2023/06/21/3d-printed-machine-shows-how-braiding-is-done/)

DingoQuadruped Is a Cheap Canine-Like Robot
https://hackaday.com/2023/06/21/dingoquadruped-is-a-cheap-canine-like-robot/

Robot humanoids are cool, but also a bit hard to make work as they only have two legs to stand on. Four-legged robots can be a bit more approachable. The …read more (https://hackaday.com/2023/06/21/dingoquadruped-is-a-cheap-canine-like-robot/)

FPGA Breakout Board For DIP Package Shenanigans
https://hackaday.com/2023/06/21/fpga-breakout-board-for-dip-package-shenanigans/