Interesting quotes (to me) from the paper:<p>> Device variability (Section 4) and volatility (Section 4.2) were mentioned as current challenges for
most applications based on memristive memories. This is in contrast with biological systems, which
are not built in clean rooms, and it is hard to believe that evolution exploits ideal systems in reference
to its own architecture design.<p>> For example, in the current digital computer, computation is carried out using strings of symbols that bare no physical relationship to the quantities of interest, while, in analog computers, the latter are proportional to the physical quantities used in the computation.