More enjoyable for me than the last couple. Cards, Piet Hien, great mini puzzles, a mention of Brighter than a Thousand Suns, one of News Scientist's top 25 most influential popular science books (on my long term reading list to get to all of them, so guess what's next?), and in addition to a lot more, a new way to calculate the day of the week a date falls on...great stuff.