Lemon battery. Too weak to power much, but demonstrates the principles.
Basic
potato battery. Second simple concept. Strong enough to power small clocks. (Though
this set-up can power a sound system.)
And
this seems like a step in the right direction.
A simple
FAQ on food batteries.
And
water clocks in brief, just 'cos. (Along with this
funny bit from the maniacs at ThinkGeek.)
Amazing the things you find when you're searching for good, sturdy lemon peel pictures. :)
It is really, really, really really cold today. Just so you know.
(Also:
coconut saves the world! Yay!)
In other wanderings...
commercials are getting scary. (For anyone who doesn't get that? Try watching
this first. Oh, and just FYI? That's not Jennifer Beals dancing, that's
Marine Jahan, seen
here dancing on her own.)
(She's not to be confused, btw, with
Slavitza Jovan who played
Gozer the Gozerian in Ghostbusters. Just so you know.)