Invisible wrote:
> Mmm - I understand you can also make a mic out of a speaker. But it 
> tends not to work well. ;-)

That's how the very first telephones worked. By the time they actually 
got to something like a switchboard (i.e., telephone rather than 
intercom) they figured they could separate the two.

> Hey, I wonder - can I use the alternator on my car to drive the car 
> instead of recharge the battery? :-D

Yes. It's called a starter motor. ;-)

-- 
Darren New / San Diego, CA, USA (PST)
  Helpful housekeeping hints:
   Check your feather pillows for holes
    before putting them in the washing machine.

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