Homebrew PCBs

> Does anyone know why aluminum is bad for house wiring?  (real question,
> not a joke)  Is it that aluminum has a greater thermal expansion ratio
> than copper, and so the connections worked themselves apart?
> Thanks
> Richard

aluminium forms a oxyde layer which is isolating. -> resistance -> heat ->
fire -> no more house...

using aluminium in wiring requires proper techniques when making 
connections.
if done right it is ok (e.g. power cables).

However, i know for sure they do not take any care with those aluminium
cables which hook your house to the main power cables...

it is also much more prone to breaking.

ST