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The sounds of the rainforest include: the chirps of birds, the buzz of cicadas, the banter of gibbons. But in the background is the almost-always present sound of a chainsaw, from illegal loggers. Engineer Topher White shares a simple, scalable way to stop this brutal deforestation - that starts with your old cell phone.

3:30 video Let's end this age-old question once and for all: Is that cell phone in your pocket giving you cancer?