A fairly well know phenomena of Dendrite (sp?) Growth shows
up in the manufacturing of printed circuit boards.
If the board is slightly contaminated (doesn't take much, oil
from fingers for example) you can watch these things grow
under a microscope. Shaped liked stair steeped lightning
bolts, look like small crystals, and while I was watching
them I'd swear they where 'alive' as they wiggled around
shorting out traces.
These Dendrites are only of a concern in very high impedance
circuits like Electrometers (Dan Davidson's Shape Power Book
shows one made out of AD515A), more 'normal' currents burn
them out.
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