Charting the life on the Mississippi of James B. Eads (1820-1887), "one of the greatest engineering geniuses of all time," says narrator David McCullough. Eads designed, built and financed ironclad river gunships in the Civil War (helping the Union win it, some say), the first steel bridge over the Mississippi, and sandbar-busting jetties at the mouth of the Mississippi that helped ensure the economic viability of New Orleans and the river itself.