LIBRA (Sept. 23-Oct. 22): Swedes used to drive cars on the left-hand side of the road, but a growing body of research revealed it'd be better if everyone drove on the right-hand side. So on Sept. 3, 1967, the law changed. Everyone switched. All non-essential traffic was halted for hours to accommodate the adjustments. The results? Lots of them grumbled about having to alter routine behavior, but the transition was smooth. In fact, the accident rate went down. You benefit from a comparable ritual sometime soon. Which tradition or habit could use a fundamental revision?