cs4fn and computational thinking unplugged

'Computer Science for Fun' (cs4fn) is a public engagement project aiming to both enthuse school students about inter-disciplinary computer science and support computing teachers. It started in 2005, with cs4fn resources now widely used in UK schools as well as internationally. We overview the approach cs4fn has used to inspire students and teachers. In particular we look at how not only subject knowledge but also computational thinking ideas can be taught in an integrated way using cs4fn 'unplugged' activities embedded in stories. We give two illustrative examples, one based on the problem of helping people with locked-in syndrome communicate, the second based around magic tricks.