Twice as many Minnesota students -- more than 5,000 in total -- attended all their high-school classes online in the 2007-08 school year, compared with the previous school year. Working online keeps junior A.J. Worth, 17, who has ADHD and mild Asperger's syndrome, organized, and has helped him improve his grades, his mother says. Officials said some students use the virtual classes to escape bullying.

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