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Jitterbug
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  This activity explores the concept of center of gravity by having learners build a Jitterbug--a motorized toy that seems to dance--using a recycled CD and a DC motor.
   
Penny Battery
Source Institutions
    
  In this activity, learners light an LED with five cents. Learners use two different metals and some sour, salty water to create a cheap battery.
  