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9V Battery with Battery Clip with leads or 4 AA Batteries and Battery Holder with leads.
LEDs - variety of colors
Playdough
Modeling Clay
Put one lead into each ball of play dough.
Make sure the balls of play dough don't touch.
Put one leg of the LED into each ball of play dough.
If the LED doesn't light, turn the LED around. NOTE: the Anode is the long leg which should be connected to the positive side of the battery; the Cathode is the short leg (flat side) which is connected to the negative side of the battery.