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4:20
Jun 17, 2016

Powering Africa

Off-grid, small-scale solar is doing what the grid cannot and powering Africa.

5:50

The sun machine is coming down

Cost has always been solar power's Achilles' heel; now it's becoming its most promising trait.

5:50
Apr 19, 2011

The new, old kid on the block

When it comes to visionaries with ideas that could change the world, it takes one to know one.

5:30

Light bulb moment

Are cheap and nasty sources of electricity better than none at all?

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