I didn't say "everything," this is kind of a side-tangent but in particular I imagine writing to the brain might be really difficult to do non-invasively while

I didn't say "everything," this is kind of a side-tangent but in particular I imagine writing to the brain might be really difficult to do non-invasively while keeping per-write side-effects as low as invasive alternatives. I disagree with your projections of the future, and expect that geosynchronous satellites will be able to infer water-flow in a given (non-shielded) pipe within the next 30 years. I could be wrong.