> Instant access to all of digital knowledge, ...

Yup, I agree. Indeed, that's the core goal of my startup, helping people find that stuff -- for a huge fraction of the content, tough to do now.

Sure, but as I mentioned in another response here, eyes are deep into both the design and the construction of the brain. Sooo, super tough to have a better intake channel.

To be fair to DARPA, my guess is that they have no intention of improving on eyes, ears, etc. but just augmenting them. I didn't mention it, but my reaction would be just go ahead and use just eyes and ears but give them, say, a better user interface.