Their control sample seems to have done something else entirely (like evaluated bottle designs or something). The correct control would have been something invo

Their control sample seems to have done something else entirely (like evaluated bottle designs or something). The correct control would have been something involving water but without the psychosocial overtones of hand washing - for example asking people to pull marbles out of a bowl of water. The reality is that "water play" is very soothing. Put an angry toddler in front of a sink full of warm sudsy water, and I don't think they are happy because they are channeling Lady Macbeth.