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Groundbreaking: Japanese scientists develop a technique to connect brain cells grown in the lab
(www.breezyscroll.com)
This is a most excellent place for technology news and articles.
Ehhh... no, not really https://www.nature.com/articles/s41598-024-54271-x
That compares a whole human vs. A graphics card. If you only have connected brain cells, I imagine that it would be much cheaper than having to sustain a whole body.
It's a pretty horrifying article tbh. The assumptions and conclusions it's making if you just start asking yourself how you actually save that energy should be obvious.