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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.

NCI Fact Sheet on cell phone and cancer

Links for 5 articles covering cancer and cell phones

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

Metals are what make smartphones so "smart." An average smartphone may contain up to 62 different types of metals. One rather obscure group of metals-the rare-earth metals-plays a vital role. The rare-earth metals include scandium and yttrium, as well as elements 57-71. Elements 57-71 are known as the lanthanides, because they begin with the element lanthanum.