Every child who's ever played a board game understands that the act of rolling dice yields an unpredictable result. In fact, that's why children's board games use dice in the first place: to ensure a random outcome that is — from a macro point of view, at least — about the same likelihood each time the die is thrown. Consider for a moment what would happen if someone replaced the dice used in one of those board games with weighted dice — say dice that were 10 percent more likely to come up "6" than any other number. Would you notice?