What's a penny worth these days? Not much, but could there be some free energy hidden inside your spare pennies? You'd be surprised! Watch the video to learn how you can put together stacks of pennies to form makeshift batteries that can drive small-current devices like LEDs and calculators.
Step 2: What Kind of Pennies?
US pennies that are newer than 1982 will work for both of these experiments, because they're nearly 98% zinc.
For more information on US pennies, including what date ranges contained what ratios of copper and zinc, click here!