Using the sun's light to generate electricity was the focus of an activity Martin provided at the recent "Science at work" days in Milton Keynes. Showing how chemists have adapted the properties of silicon for photovoltaic cells was the background for about 480 pupils to investigate how these cells work.
They made solar-powered fans but, this being Britain, had to test them most of the time under lamps rather than outside in bright sunshine.
But everyone had a great time!