Electric Field of Dreams Intermediate 07/06/2011 Eating & Exercise Intermediate 07/07/2011 Collision Lab Intermediate 06/08/2011 Shepard Tone Intermediate 10/28/2011 Signal Circuit Beginner 07/06/2011 Circuit Construction Kit (DC Only) Beginner 07/06/2011 Circuit Construction Kit (AC+DC) Beginner 07/06/2011 Capacitor Lab Advanced 06/16/2011 Battery-Resistor Circuit Intermediate 06/16/2011 Battery Voltage Beginner 06/16/2011