If you think you're a great investor, or even a moderately competent one, perhaps I can challenge you to a little game. It consists of nothing more than flipping a computer-simulated coin for 30 ...

Tama is one of my favorite types of games — a simple interface but a daunting challenge. Can you toss the coin into the pit so that it lands in a green or red pit, but not in a black pit? Can ...