With the stack of 10 pennies, I attached a green LED and wrapped it all up with electrical tape in hopes to make it air-tight.
I set it on my shelf and watched it for a few hours to see when it would die out.
I was amazed that the light actually stayed lit for over 16 days!! I really am impressed at how well that worked out!
Well, there's an energy idea that's worth a few cents.
Haven't see the video yet? You can still see it here!
If you like this project perhaps you'll like some of my others. Check them out at www.thekingofrandom.com