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More than 200 tops spin in vessels half-buried in the dirt outside Stephentown, N.Y., a town near the Massachusetts state line. Inside the vessel a vacuum permits each top to rotate as many as 16,000 times per minute, despite the fact that each weighs more than one metric ton, thanks to its steel and carbon-fiber composition

In places around the world where the grid hasn't been extended, they're still figuring out ways to power their gadgets. We could learn a thing or two. Globally, there are 5.3 billion mobile phone subscribers--but according to Green Power For Mobile by The GSMA Development Fund, nearly 500 million people worldwide do not have a means of charging a mobile phone at home.

In the future, electric cars will work together with the smart grid to charge at off-peak hours and put energy back into the grid when its needed. For the first time, we're seeing this plan in action. Automakers and power companies have talked for years about the day when electric cars could work together with the smart grid by charging only during off-peak times and even giving energy in their batteries back to the grid.

Solar panels give you clean energy, yes, but it turns out that's not all. Just by putting them on the roof, you'll start saving cash on your cooling and heating bills. Installing photovoltaic solar cells is a great way to easily tap into an environmentally-sustainable energy source, and in sunnier parts of the world it's even feasible to use them to actually make money by selling power back to the grid as part of a smart grid installation