Read this message board thread. It lays it all out: http://boards.straightdope.com/sdmb/showthread.php?threadid=60812 http://boards.straightdope.com/sdmb/showt

Read this message board thread. It lays it all out: http://boards.straightdope.com/sdmb/showthread.php?threadid=60812 http://boards.straightdope.com/sdmb/showthread.php?threadid=... This post is the standout: http://boards.straightdope.com/sdmb/showpost.php?p=1147211&postcount=26 http://boards.straightdope.com/sdmb/showpost.php?p=1147211&#...