 About 100 people drown from rip currents along U.S. beaches each year. That's according to the U.S. Life Saving Association. And more than 80% of beach rescues annually involve rip currents. John Scott reporting. And a man who was bitten by a shark over the weekend on Florida's northeast coast is on the mend this morning. Officials from the Nassau County Sheriff's Office north of Jacksonville say they found the victim aboard a boat with a nasty shark bite on his arm.