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Submission + - Solar dye directs light to PV on sides of glass (inhabitat.com)

Eclipse-now writes: "MIT’s solar concentrator maximizes its mileage by using an efficient expanse of light-collecting glass to guide sunlight into a minute array of potent photovoltaics. The glass panels are coated with a dye that absorbs sunlight and channels it along the pane’s edges while altering its wavelength to reduce energy loss from light transportation. The result is a system that can collect light over a very large area, but requires a very small array of solar cells."

In other words, it's way cheap!

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Every nonzero finite dimensional inner product space has an orthonormal basis. It makes sense, when you don't think about it.

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