A lot of them were shifted 1 second into the future following the problems with the cracked frampton valve on a popular model of felindrical phase felcher.
Every time I want to do something, I have a look around the baffling ecosystem of frameworks and end up writing it from scratch because it's easier than wading through the bullshit.
FreeCAD can be a right pain in the arse and things can blow up spectacularly, but it does force you to use discipline in your designing. It's a great tool if you are careful and don't cut corners. Other than with the mitre tool, ho ho.
Loads of things superconduct below 10K - aluminium for one. This is for a different type of superconductor that can be turned on and off with a magnetic field.
That's all right. I didn't want my kids to have a habitable planet anyway.