University 
                  of Toronto students, after being asked to think about past unethical 
                  acts, were twice as likely to respond to an offer to wash their 
                  hands as students who had not imagined past sins. 
                   
                  Those who washed were less likely afterwards to sign up for 
                  some charity volunteer work.  
                  New 
                    Scientist, September 7, 2006. 
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