"But all of the above will not get electronics down to the energy-efficiency of the brain.
"That will require many more changes, including a move to analogue computation instead of digital.
"It will also involve breakthroughs in new non-Turing models of computation, for example based on an understanding of how the brain processes information."
What exactly does all this mean? How would moving from digital to analogue computation improve energy efficiency? And aren't the whole Turing vs. non-Turing models of the brain still up for serious debate?