Five years ago, the CGI tale of a Viking boy becoming friends with a toothless dragon was a massive global box office success. So a sequel soaring into cinemas was inevitable. But this time the movie makers behind "How to Train Your Dragon 2" were armed with a secret weapon: new revolutionary 3D technology called Apollo. We tell you more.
Also on the show, we go from films to infra-red. The recent discovery of another painting hidden beneath an early Picasso masterpiece, "The Blue Room", is the latest in a number of finds made possible by X-ray technology that analyses the different layers of paint used. Now the question conservators are hoping to answer is simply this: who is the mystery man underneath?