October 9, 2008 9:46 am General Motors Plunges 20% General Motors stock is below $6, reports CNBC’s Phil Lebeau US & World Videos 1:21 Watch the trailer for NBC's My New Favorite Olympian 1:46 Heat waves getting hotter, longer, and more frequent because of climate change 1:03 More than 2,000 people buried alive in Papua New Guinea landslide, Government says 45:40 How this surgeon wants to reinvent the American urgent care center 1:56 Mike Tyson ‘doing great' after health scare on flight