I asked this question several years ago[0], and had some very interesting responses. The long and short of it was that yes, they are real, and you can make them

I asked this question several years ago[0], and had some very interesting responses. The long and short of it was that yes, they are real, and you can make them yourself. The basic concept being that different metal oxides have different resistances; so if you make a "sandwich" like metal_1-oxide-metal_2 you can use current to move the oxygen ions from one metal to the other. The resistance of the sandwich changes as you do so, and stays set in between applications of charge, as well as staying set if the probing current is not too high. I recall making one was a fun afternoon project. [0]https://electronics.stackexchange.com/questions/76097/what-are-the-characteristics-of-a-memristor https://electronics.stackexchange.com/questions/76097/what-a... [1]http://sparkbangbuzz.com/memristor/memristor.htm http://sparkbangbuzz.com/memristor/memristor.htm