At ~28:00 is he saying that the optimal computing device could operate 27 orders of magnitude more efficiently that what we use today?
At ~36:00, finally something to make me sit up. "content addressable store".
* https://en.wikipedia.org/wiki/Chord_(peer-to-peer)
* https://en.wikipedia.org/wiki/KademliaKurzweil has pointed out that one can think of the 10^15 state changes per second going on inside a 1Kg rock with no outside energy input as a computation device.
Ok, so at 28 minutes, he's referring to some quantum mechanical lower bound to change a bit. I imagine the rock is using that really tiny amount of energy from the outside environment.
"content addressable store" or cam (content-addressable-memory) is pretty well-known in cpu-arch, n/w equipment etc. domains. hashtables are s/w counterparts :)