Oh, it's not a science fair scam - it's a great way for kids to learn about electricity! Compare it to sticking similar nails in a few other objects, and you've

Oh, it's not a science fair scam - it's a great way for kids to learn about electricity! Compare it to sticking similar nails in a few other objects, and you've got yourself a poster. But it's also not as simple as growing a field of lumpy batteries.