Hand Washing Helps You Live With Your Terrible Decisions 2.42K Maureen O'Connor 05/06/10 06:02PM Filed to: Hygiene Hygiene Psychology Studies hand washing Lady macbeth Turns out Lady Macbeth was right. A study suggests washing hands not only helps cleanse your conscience, but helps you convince yourself you made the right choice, because it "reduces the influence of past behaviors" in your head. [SciAm, pic]