DIY
HorizonSight 360° a Helmet-Integrated Rear-Awareness AR and Mission-Control Vision System
HorizonSight 360 gives a helmeted operator eyes in the back of their head, and gives their team eyes everywhere at once.
DIY
DIY
Free Open Source Compact Car (FOSCC): Build a Street-Legal DIY Car From Salvage Parts for Under $10,000
Open-hardware plans for a street-legal DIY compact car: salvaged 4-cylinder powertrain on a builder-welded steel frame for under $10,000.
DIY
Discord Spam Bot Protection: 4 Ways to Lock Down Your Server
Spam bots overwhelming your Discord server? Compare four protection options, from custom verification bots to manual vetting.
Batteries
What Is the Voltaic Pile? How the First Chemical Battery Worked
Learn how Alessandro Volta’s voltaic pile worked, how it was built, and why it became the first practical chemical battery.
Science
DIY Alpha Radiation Detector: PIN Photodiode Build Under $30
Build a working alpha radiation detector with a decapped PIN photodiode and charge-sensitive amp for under $30. Includes the paper-sheet test.
Offgrid
DIY Push Sickle-Bar Mower: Open-Hardware Plans / Recycled Salvage
Open-hardware plans for a push sickle-bar mower: salvage-first BOM, honest physics, and why a ~$120 electric-assist build beats a $4,000 BCS.