Photovoltaics are wonderful, but there are some far cheaper ways to harness the power of the sun to do good work for us. Capturing the sun's heat with solar water heaters, for example, is a far cheaper way to reduce your electricity bills than trying to turn that power into electricity.
Well, a new company called Practical Solar wants to take that up another step, and simply use mirrors to focus sunlight on your home, to keep it warm in the winter. Of course, this only works for people who get direct sun in their yards, and who live in sunny but cold places, but that's not an insignificant number of people.
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