You might think that if you dug some tunnels down into the ground where you could be out of the sunshine, that you might find them to be relatively cool …read more (https://hackaday.com/2026/09/29/geothermal-cooling-for-new-yorks-subways/)

Electromechanical TV Goes 3D with This Light-field Display
https://hackaday.com/2026/09/29/electromechanical-tv-goes-3d-with-this-light-field-display/

A mechanical TV — the kind that makes an image with a Nipkow disk and a single lamp with some help from persistence of vision — is easy enough to …read more (https://hackaday.com/2026/09/29/electromechanical-tv-goes-3d-with-this-light-field-display/)

Improved Double-Sided Toner Transfer Method
https://hackaday.com/2026/09/29/improved-double-sided-toner-transfer-method/

In the era before PCB shops would make almost any PCB imaginable, as well making many other manufacturing processes for prototypes available to hobbyists, there were several ways of making …read more (https://hackaday.com/2026/09/29/improved-double-sided-toner-transfer-method/)

Designing a Fully 3D-Printed Mechanical Calculator
https://hackaday.com/2026/09/29/designing-a-fully-3d-printed-mechanical-calculator/

Even if almost tragically impractical in a world where digital calculators are cheap as chips, mechanical calculators and their big mechanical computer brethren remain an absolute marvel of engineering. Using …read more (https://hackaday.com/2026/09/29/designing-a-fully-3d-printed-mechanical-calculator/)

The Deep Magic of 3D Graphics Perspective
https://hackaday.com/2026/09/29/the-deep-magic-of-3d-graphics-perspective/

Many of us of a certain age will have had their first true, good 3D video game experience with Super Mario 64. Unlike previous 3D games, the camera was an …read more (https://hackaday.com/2026/09/29/the-deep-magic-of-3d-graphics-perspective/)

Determining Diamond’s Properties Under Extreme Pressures
https://hackaday.com/2026/09/29/determining-diamonds-properties-under-extreme-pressures/

Although graphene gives diamond a solid run for its money when it comes to being the most useful assembly of carbon atoms, both have the distinct property of material scientists …read more (https://hackaday.com/2026/09/29/determining-diamonds-properties-under-extreme-pressures/)

No More Windows For The Dutch Government, Ze Kiezen Nu Linux
https://hackaday.com/2026/09/29/no-more-windows-for-the-dutch-government-its-linux-all-the-way/

The events of the last few years have caused many in Europe to re-evaluate their reliance on large offshore technology companies, with a corresponding move to home-grown EU-based alternatives. It’s …read more (https://hackaday.com/2026/09/29/no-more-windows-for-the-dutch-government-its-linux-all-the-way/)