'Finding Dory' outswims 'Independence Day,' while 'The Shallows' surprises

Two aquatic tales -- one geared for families, the other for scare-seeking teens and adults -- helped to buoy the weekend box office, with Disney / Pixar's "Finding Dory" retaining the No. 1 spot and the shark-attack thriller "The Shallows" exceeding expectations in its first weekend to come in...