Scientific American presents Math Dude by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. There are tons of practical, real-world applications of ...

Start with a deck of cards. Before the trick, sneak a peek at the 10th card in the deck. Memorize it. Ask your volunteer to add the first and second digit of their number together. For instance, if he ...

Our girl Anna passed on this little video to me, alerting me to a new trick for dudes to score your phone number. Behold: Well, what do we think? You guys, maybe I am just being a humorless beast, but ...