That MacOS (formerly OS X) has BSD roots is a well-known fact, with its predecessor NeXTSTEP and its XNU kernel derived from 4.3BSD. Subsequent releases of OS X/MacOS then proceeded …read more (https://hackaday.com/2025/11/22/ravynos-open-source-macos-with-same-bsd-pedigree/)

Building an Acoustic Radiometer
https://hackaday.com/2025/11/22/building-an-acoustic-radiometer/

A Crookes radiometer, despite what many explanations claim, does not work because of radiation pressure. When light strikes the vanes inside the near-vacuum chamber, it heats the vanes, which then …read more (https://hackaday.com/2025/11/22/building-an-acoustic-radiometer/)