This is a simple PowerPoint I made for my Year 11s to teach the relatively straightforward new topic of Capture Recapture. It has a link to a video featuring Jonny Ball demonstrating it in practice which is quite good. I tried to embed it as a flash vide but I've included the YouTube link if that doesn't work.
I've also included the joke codebreaker I got my Year 11s to do, seeing as they seem to enjoy doing these! The joke should be "How do you keep an idiot in suspense?"