September 4, 2012 8:32 am Whole Body Scans: Worth the Effort? Studies find few benefits in preventative whole body cancer scans. Kay Quinn reports. US & World Videos 1:10 Bay Area app monitors problems for people living with Parkinson's 1:43 Traces of bird flu virus found in 1 in 5 samples of pasteurized milk, FDA says 2:42 Mother, surrogate celebrate a perfect ending to their long journey 1:12 Watch: Why vaccines are contributing to improved public health 1:53 The Helix School in San Rafael growing with the community