I don't know what it is about electrical circuits that make kids go nuts, but they had the best time today. All of the kids were given a board with a battery compartment, a light bulb, a buzzer, and a switch, and they had to use wires to light the bulb, sound the buzzer, etc. I gave them a few directions and then just ... let them have at it. Some groups did well and kept experimenting, some had difficulty... and two children stayed after for fifteen minutes while their moms waited, gathering up wires and hooking them to the board. Eventually, with about ten wires and a lot of jerry-rigs, they got the switch to turn the light AND buzzer on and off simultaneously. They were so proud of themselves, it was unbelievable. Hell, I was impressed. I can barely hook the thing up to get the light to go on.
Things may suck a lot of the time, but it's so worth it for moments like these.