May 12, 2014 11:34 pm Toxic Plumes: The Dark Side of Silicon Valley There’s a dark side to the legacy of Silicon Valley: hundreds of old chemical spill sites that still contain toxic chemicals. Stephen Stock reports in a story that aired Monday, May 12, 2014. US & World Videos 0:28 A Vermont state trooper plunges into icy pond to rescue 8-year-old girl 2:59 Keep these travel etiquette tips in mind this holiday season 2:20 Bodies of Missing Men Found in Rubber Bins Inside Storage Unit 1:42 Hundreds of Golden Retrievers Walk a Mile for the Official Boston Marathon Dog 1:51 Typewriter Shop Owner Receives Gift From Tom Hanks