This one is puzzling thousands of people. St. Bernard Parish, virtually wiped out following Hurricane Katrina, is seeing the spontaneous growth of watermelons. They're everywhere! It's a post-Katrina phenomenon that has even the experts baffled. "I've never seen anything like this before," said Dr. Ron Strahan of the LSU Ag Center as he surveyed the watermelon infestation. The fruit, which is normally planted in April, has been sprouting up all over St. Bernard Parish ever since Katrina. Presumably, the seeds were deposited during the hurricane and unusually high temperatures have produced a natural mystery. "It's just going to be one...