MarkT:
Or put another way, electrons don't wear out!
Yea. electrons are the only moving parts in a AVR chip.
OT, but also any one specific electron is pretty slow poke. An instructor once explained that while the electron current flow through a conductor is near or at the speed of light, a specific given electron may take years to travel from one end of a 12" wire to the other. Not sure about the year part (I'm old now!), but it was of a duration that made my jaw drop as I slowly got an appreciation of how many damn electrons are in a 12" 22 gauge piece of copper wire.