 CBS News Brief. July 4th celebrations have included parades nationwide in Three Lakes, Wisconsin. It's wonderful. The planes going by, the fire engines, the kids waiting for the candy. It's fantastic. And now the fireworks. Four reported shark attacks in South Padre Island, Texas today. In one case, a shark appears to have taken a significant portion of the victim's left leg. CBS's Manuel Bohorquez in Deerfield Beach, Florida, reporting there's been an