Some are cool, some are odd. FULL DISCLOSURE: If you're not into geography and history, some may actually be (GASP!) boring. But I guarantee no math!
BTW, I just published a novel, Atomic Duet - An FBI Story, available on Amazon. Many reviews and a link to the book can be found by click-inating here. Some laughs guaranteed in those reviews. The Kindle version will be free to download for ANYONE who uses a Kindle reader from July 20th to the 23rd to celebrate the premiere of the new Christopher Nolan film, "Oppenheimer."