On Thu, 09 Jul 2009 20:14:54 +0700, Bruce In Bangkok
wrote:

The marvels of electrolyses. You can do the same thing with a lemon, a
galvanized screw and a piece of copper wire.

Yes, it is easy to make a battery out of a lemon. It's not a very
good battery however. That's because it was designed to be a lemon,
not a battery, same problem with a sea water battery. It's
interesting to see guys working on things like that, and every once in
a while something useful comes out of it.