It's science fair time again!

You may remember three years ago when The Girl did a science project about yeast a couple years ago.  My folks were in town and my mom helped her do it--it was painless for everyone and the project was a success.  The only downfall was that the house smelled like fresh bread and there wasn't any bread.
This year, it is the boy's turn.  He had heard somewhere that fruit could be used as a battery.  After using about 8 lemons, The Boy and Mr. IM discovered that there is an issue with the current (description here), but it was a very interesting project for all of us (and the house smelled good, like lemons!)