I recently visited a museum with my son, and we both enjoyed an exhibit where there was a partially completed circuit that was completed when you touched the two end points or joined hands and each touched one of the end points. The setup had a D battery and a small array of LEDs. The LEDs would light up when you completed the circuit with your body.
My son asked me to make one for him at home, so I took an array of LEDs from a flashlight and soldered together a similar setup. The problem is that it didn't work when you completed the circuit with your body (it did when you used something with less resistance, like a wrench).
What am I missing here? I'm no electrical engineer (I'm a computer science/math geek but I do like to tinker around with electronics and I have a working knowledge of residential electrical setups), but it seems to me the issue is related to the resistance of our bodies. If that's the case, then how could it ever work like it did in the museum with such a small power source? How can I get my experiment working?