Hi again,

There are different types of memristors apparently, and none of the dictionaries known any of them

The dont even know how to spell 'memristor' yet

Anyway, there are different types of memristors but to understand them basically all you have to do

is think of a device like a resistor whos resistance changes based (sometimes) on the history

of another parameter that is associated with the device. In other words, it would be almost

like measuring one parameter that changes naturally and using that measurement to force another

parameter to change. That's such a general statement i know, so here is a simple example of

a charge controlled memristor...

There is a little guy sitting next to a wire and he can see every electron that passes by. He has a

counter in his hand and every time an electron passes from left to right he clicks it up one notch,

and whenever an electron passes from right to left he clicks it down one notch.

The total accumulation on his counter is used to set a variable resistor like a pot. For this

particular memristor the resistance in ohms is equal to the absolute value of the count, so if he

counts up 10 the resistance becomes 10, and if he counts up another 10 that totals 20 so the resistance

is 20 ohms, then if he counts 10 backward the total is back down to 10 so the resistance

again becomes 10. If the count gets back down to zero the resistance goes back down to zero.

The only difference with a real life device like this is that at some point the device would

saturate, and also there would be some time response to consider.

The other interesting thing is that we dont have to assume a linear response. A possibility

is even a 'programmed' nonlinear response that is programmed in such a way as to fit the

application perfectly.

I made an very early type of memristor way back in the 60's when i connected too much

voltage to a relatively small value (1k) resistor. After it turned black it had no

trouble remembering that it went from a 1k resistor to a 500 megohm resistor

Here's a pic of another memristor being manufactured via serendipity again:

And as if that wasnt enough proof that they really do exist, here is a new manufacturing plant for

memristors in live action:

http://www.youtube.com/watch?v=ZTmRjZrS9ZY
LEDs vs Bulbs, LEDs are winning.