Over on YouTube [Applied Science] shows us how to make an f/0.38 camera lens using an oil immersion microscope objective. The f-number of a lens indicates how well it will …read more (https://hackaday.com/2025/10/17/f-0-38-camera-lens-made-with-oil-immersion-microscope-objective/)

Radio Astronomy in the Palm of Your Hand
https://hackaday.com/2025/10/17/radio-astronomy-in-the-palm-of-your-hand/

When you think of a radio telescope, you usually think of a giant dish antenna pointing skyward. But [vhuvanmakes] built Wavy-Scope, a handheld radio telescope that can find the Sun …read more (https://hackaday.com/2025/10/17/radio-astronomy-in-the-palm-of-your-hand/)

A New Way to Make (Almost) Holograms with Lasers
https://hackaday.com/2025/10/17/a-new-way-to-make-almost-holograms-with-lasers/

The spectrum of laser technologies available to hackers has gradually widened from basic gas lasers through CO2 tubes, diode lasers, and now fiber lasers. One of the newer entries is …read more (https://hackaday.com/2025/10/17/a-new-way-to-make-almost-holograms-with-lasers/)

Channel Surfing Nostalgia Machine
https://hackaday.com/2025/10/17/channel-surfing-nostalgia-machine/

As any generation of people get older, they tend to look back fondly on their formative years when there was less responsibility and more wonder. Even if things have objectively …read more (https://hackaday.com/2025/10/17/channel-surfing-nostalgia-machine/)

Hacking a Banned Chinese Security Camera
https://hackaday.com/2025/10/18/hacking-a-banned-chinese-security-camera/

Over on YouTube [Matt Brown] hacks a Chinese security camera recently banned by the US government. If you didn’t hear about this you can find out more over here: Major …read more (https://hackaday.com/2025/10/18/hacking-a-banned-chinese-security-camera/)

A Solar Oven for Cloudy Days
https://hackaday.com/2025/10/18/a-solar-oven-for-cloudy-days/

Every Boy Scout or Girl Guide probably had the experience of building a simple solar oven: an insulated box, some aluminum foil, and plastic wrap, and voila! On warm, sunny, …read more (https://hackaday.com/2025/10/18/a-solar-oven-for-cloudy-days/)

Precision, Imprecision, Intellectual Honesty, and Little Green Men
https://hackaday.com/2025/10/18/precision-imprecision-intellectual-honesty-and-little-green-men/

If you’ve been following the hubbub about 3I/ATLAS, you’re probably either in the camp that thinks it’s just a comet from ridiculously far away that’s managed to find its way …read more (https://hackaday.com/2025/10/18/precision-imprecision-intellectual-honesty-and-little-green-men/)

Broken Phone To Cinema Camera With A Lens Upgrade
https://hackaday.com/2025/10/18/broken-phone-to-cinema-camera-with-a-lens-upgrade/