Our phones are powered by teeny tiny semi conductors. Taiwan produces over 60% of them. Huawei recently unveiled a phone with a chip made in mainland China. Chris Miller is an expert on this subject. He tells us why the United States is wary of this move.

We know our phones have a chip in them, but what’s it made of? And what else is in our phones? They’re built with metals and materials from some of the poorest countries in the world. They’re also designed to be difficult to recycle, leading to lots of technology waste. The BBC’s Science Correspondent, Victoria Gill, explains why our phones are made this way and what their life cycle is.

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