Silicon Valley is mostly a world of practical technology—applying principles from pure science to create handy gadgets. But today, Hewlett Packard announced a new electrical component born of theoretical physics. The device, a nanoscale component called a "memristor," requires no power to retain data, which it can store more densely than a hard drive and access about as fast as a computers RAM memory—potentially allowing it to replace both components in the future.
from my limited research, it appears that no voltage=no loss. Applying voltages to either side of the memristor adjusts the "slider" of voltage between the two extremes. Using AC power, you can read the value without altering it.
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