Jurors in Minnesota's tobacco trial today heard testimony relating to two of the state's major claims in the case - that tobacco companies manipulated nicotine in cigarettes to hook smokers, and marketed their products to young people. Minnesota Public Radio's Laura McCallum reports... Jurors watched the video-taped deposition of Brown and Williamson's director of leaf blending taken two months ago. Roger Black said B and W contracted with a company called DNA Plant Technologies to genetically alter tobacco plants to increase nicotine content. He said the resulting strain - known as Y-1 - has twice the nicotine of conventional tobacco plants. Black sa