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Paul Waweru is going shopping.
He’s on the hunt for old laptop batteries. They cost him just KSH 50 ($0.50) per piece, but this Kenyan high school physics teacher has found an innovative use for the waste product.
They will power bikes. After he collects the items from dealers in Nairobi, he takes the haul back to his workshop.
Here, he sorts them, dividing the working cells from those which are not working.
Waweru then…
