Probably just didn't really buy the house. Many houses are part of an association (BRF). When you buy one, you practically only buy the right to live in the house plus a share of the entire association. The fee that she paid was towards that association for things like maintainance, managment, trash-fees, internet, parking, likely heating and water, and possibly interest on the associations loan. It's just a different structure that many countries have for flats in a building, in this case applied to single family houses.

Would be cool if it could also de-knit to modify clothing or reuse later. I.e if there is a hole: automatically deknit, splice in a replacement and fix it. Or if your belly growth: deknit and make that section slightly wider.

And can you use finer yarn as well, like lace? The reason a sweater is knit like it is, is because of the tradeoff between knitting time and material needed. But if labor becomes free, you should be able to knit much bigger yet more delicate stuff.

Edit: ah, deknitting is called frogging

I never understand those calculations. You can buy houses in Berlin from around 350k. Maybe not in that area you are looking but still. With something like 600 to 800 sqm ground, house around 100 sqm, quiet neighborhood, 10 min walking to S-Bahn (i.e my grandmothers neighbors house that was sold a few month ago). Probably add 100k for renovation. But with 3.5k of savings a month (from 6.5k easily possible), you have paid it of in ~10 years.

Ideally, you have 300% renewable energy available and then modulate actual production based on demand.

That does not seem to be a long term problem. Wind and solar can be down regulated with ease (and within fractions of a second), a negative prices only happen because producers got a flat-fee per kWh which is pretty much phase-out now. The problem is rather that Germany (plus Luxembourg) is still a single price zone, i.e when wind is blowing in Hamburg, the per-kWh price in Passau is also nill. While this is nice for Bavaria (the main culprit, as usual), there is an enormous cost for this in the form of re-dispatch fees as long as the grid is not strengthened a lot.