Picture yourself lounging on your sofa after lunch on a lazy Saturday afternoon, the TV's on, but your mind's in a bit of a muddle. What to do for the rest of the day? You've got a gazillion things ...

before you. On each tab, YES or NO is written in bold letters. Like clockwork, it pops up whenever you feel stuck—your own personal wheel of fortune, only it never asks you to buy a vowel. If you are ...