Ryssdal: Thomas Thwaites. His book is called “The Toaster Project: Or a Heroic Attempt to Build a Simple Electric Appliance from Scratch.” Thomas, thanks a lot. Thwaites: Thank you, Kai.

Log on to the Scratch website and you’ll see many different projects created by other users. Choose on a project and the animation will appear in a small box, with instructions on the right.

For those schools participating in the final round of Scratch Clubs, the 2013 Scratch Competition deadline is Friday, April 19, 2013. Completed projects will be collected during each school's ...