Great whites and tigers are bigger, but the scariest shark people are likely to encounter in Florida is the bull shark. A bull was blamed in the fatal attack June 25 on a 14-year-old girl, bitten in the leg as she swam off the beach in Walton County in the Panhandle. A bull is also suspected in an attack Monday, when a shark bit a teenager swimming in waist-deep water 80 miles from the site of the Saturday attack. Doctors amputated the boy's leg, but he is expected to recover. A third attack, on Friday, injured an Austian who was...