Adventurer starting swim down Missouri River

Thursday, August 9, 2012 | 4:26 p.m. CDT

SIOUX FALLS, S.D. — After trying similar feats with a kayak and skateboard, British adventurer Dave Cornthwaite turns his attention to swimming Friday as he embarks on a 1,000-mile journey down the Missouri River that will take him from Chamberlain, S.D., to St. Louis.