The fruit fly brain has 125,000 neurons.
A mouse brain has 70,000,000.
A human brain has 86,000,000,000.
Eon Systems just closed the sensory-to-action loop at 125K — with 95% motor prediction accuracy (Nature, 2024).
The jump to mouse isn't a science problem. The jump to human isn't a science problem.
Both are just engineering, time, and compute.
We've been asking "can it be done?"
The question is now "when, and under whose infrastructure?"