Three researchers were killed in severe weather in Oklahoma. Professional storm chasers say there's been an increase in the number of amateur chasers - many inspired by the movie "Twister" - who are ... more 
Three researchers were killed in severe weather in Oklahoma. Professional storm chasers say there's been an increase in the number of amateur chasers - many inspired by the movie "Twister" - who are putting their lives at risk. Anna Werner reports. less 
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Mon, Jun 3, 2013 9:48 PM EDT