Statistics Source: Ice Cream and Crime?

I am unable to find the original study (if indeed there was a study) but it is a popular topic in statistics cles. You can get a powerpoint lecture that includes it here a href="http://www2.bakersfieldcollege.edu/gleblanc/statistics/stats%20heiman%20lectures/statistics%20chap%202%20lecture.ppt" rel="nofollow"http://www2.bakersfieldcollege.edu/glebl…/a