Which was how shefoundherselftalking to NelsonMandela in hiscellonRobben Island in 1967, or tramping throughsquatters' campsofplastic sheets andcorrugated iron.
Nelson says the prototype will collect 25 percent of the sunlight hitting the cell (about six to ten percent better than current technology) by trapping photons inside a bowl-like photovoltaic chamber until it they are absorbed.