Harry, Larry, and Moe are sitting in a circle so that they see each other. The game is played by a judge placing either a black or a white hat on each person’s head so that each person can see the others’ hats, but not the hat on his or her own head. Now when the judge says “GO,” all players who see a black hat must raise their hands. The first player to deduce (not guess) the color of his own hat wins the game. Now, the judge put a black hat on each player’s head, and then says, “GO.” All players raised their hands and after a few moments Moe said he knew his hat was black. How did he deduce this?