The five most popular stories on CNN.com in the past 24 hours, according to NewsPulse.

U.S. swimmer dies during event in UAE: A 26-year-old member of the U.S. national swimming team died Saturday during an open-water race in the United Arab Emirates, according to event officials.

Shark kills 19-year-old man in California: A shark attack Friday killed a 19-year-old college student off a beach on Vandenberg Air Force Base, said authorities in Santa Barbara County, California.

Toddler pricked by contaminated needles: A girl taken to a clinic for a skin rash had to be treated with a drug cocktail to prevent HIV and hepatitis after she was accidentally pricked by contaminated needs on the floor.

Police find possible drug lab at Georgetown: Authorities have arrested two Georgetown University students and another person in connection to a suspected drug lab found inside a dormitory Saturday morning.

Conn. allows limits on WWE gear at polls: Republicans lashed out Friday after the Connecticut secretary of state said poll workers would have the right to ask voters wearing World Wrestling Entertainment merchandise because it would be considered campaigning.