The Weight of Light

Designer Jim Reeves's low-cost gravity-powered light uses a descending weight to bring lighting to off-grid homes in sub-Saharan Africa.

A simple, ingenious invention shows how a falling weight can change evenings for families without power.

Off-grid communities such as those in sub-Saharan Africa can pay thousands of times as much as the rest of us for their energy. Designer Jim Reeves has developed a simple, low-cost gear-train and generator that uses a de

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