[04:36] If you are interested in Sudoku, there is a YouTube channel you might like, called Cracking The Cryptic. Here is an example of what their videos are like, with a link to the Sudoku in the description below. I find it fascinating to watch a brain at work, so to speak (and the pure joy and excitement when something becomes clear). Also I like to try the puzzles myself, but most are just above my level.