Electricity

DIY Powerwalls – rechargeable lithium-ion battery installations, made from recycled batteries – are the future of power, whether you know it or not.

There is some evidence that an electric charge applied to the right part of the head can improve memory and learning and help treat anxiety and depression.

Simon visits the inventor Hiromi Nakamura who is researching electric taste.

An estimated 113 million tons of coal ash are produced annually in the US, and stored in almost every state—some of it literally in people's backyards.