The weight of light: how gravity is illuminating sub-Saharan Africa Subscribe to Guardian Science and Tech ► bit.ly/substech 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 descending weight to power a perpetual light source. Children can do their homework and study, families and friends can eat together and interact after dark adding new dimensions and possibilities to their lives Supported by Renault. The future of power ► www.theguardian.com/environment/series/the-future-of-power The Guardian on YouTube: The Guardian ► is.gd/guardianyt Guardian Football ► is.gd/guardianfootball Guardian Music ► is.gd/guardianYTmusic Guardian Australia ► is.gd/guardianaustralia Guardian Culture ► is.gd/guardianculture Guardian Wires ► is.gd/guardianwires Guardian Food ► is.gd/guardianfood Watch Me Date ► is.gd/watchmedate

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