> Possibly the most alarming part of this whole thing is the number of forum 
> users who have managed to compute the actual resistance of the tangle of 
> resistors near the middle.

V = I * R for each resistor
and
Sum(current into a node) = 0

Solve.

There's probably a matrix method for doing it, where you get to invert a big 
matrix, rather than solving all the simultaneous equations by hand.

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