This is very cool. From way back in 1971 a professor Leon Chua at the University of California (Berkeley) wrote a paper describing four basic passive electrical components: resistors, capacitors, inductors, and memristors. Until this year, the last one of these was only theoretical in nature, but some bright folks have finally cracked it.

This is likely to crack open a whole boatload of new types of circuits and electronic applications. Very, very cool.

Memristors, they exist!