>>> this is an impressive feat coming to us from revere beach. it's made out of sand. the annual sand sculpture contest in massachusetts north of boston honoring the 100th anniversary of the famous ballpark. wicked awesome. welcome back to "cbs this morning." >>> well, it's only july but today is the third friday already -- friday the 13th of 2012. that's a good thing because that's as many as you can have in one year. that's great if this day makes you nervous. >> here's mo rocca. >> for most of us friday the 13th is just another day. for others it's a day to dread. friggatriskaidekaphobia, that's the fear of friday the 13th. frigg was the nors goddess for whom friday is named. triskaidekaphobia a fear of the number 13. >> the superstition about friday, friday being an unlucky day is quite old. >> psychology professor stewart buys studied the origins of