mikejuk writes: The Google Doodle is often a masterpiece of design but this time it is a masterpiece of computer science. The doodle is a complete Turing Machine that you can interact with in an attempt to solve a puzzle. You have to select which logical elements are needed to convert one number on the tape into a target number. The article explains the increasingly difficult steps of the puzzle but then lets you solve it — but there is a YouTube video that simply gives you the answers if you really get stuck.
"The Avis WIZARD decides if you get to drive a car. Your head won't touch the
pillow of a Sheraton unless their computer says it's okay."
-- Arthur Miller