[brazzy]

There's also Thomas Thwaites' "building a toaster... from scratch" project that goes into the details of how even an extremely simple appliance involves materials and processes that are effectively impossible for a single person to replicate (spoiler: he has to give up and "cheat" on some things).

[Cthulhu_]

Likewise, someone (I forgot who) who made a sandwich from scratch - growing wheat, pigs, cows, produce, the works.

[maxwell]

https://www.youtube.com/watch?v=URvWSsAgtJE