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An electric tractor that?s entirely powered by the sun could boost crop yields for farmers in sub-Saharan Africa and in doing so, improve access to electricity. Developed by Aftrak, a business spun out of Loughborough University, in England, the waist-height ?micro electric tractor? powers itself forward, while a farmer steers it as they walk behind. It features a steel ?hardpan breaker? that pierces the layer of compacted soil commonly found at the surface of manually farmed fields in sub-Saharan Africa. Breaching this layer and making deep furrows allows roots and rainwater to penetrate the soil, which slows soil erosion and maxmizes water absorbtion, making the soil more resilient to...