Folded in his bunk aboard the U-505 submarine, with temperatures topping 100 degrees, a German sailor recorded his misery: "For a few days now we have been 'enjoying' the tropical heat. Everybody is perspiring freely,'' he writes. "Even in the bunks it takes only a few minutes until everything is soaked wet. The heat is so unbearable. ... "Sometimes wish I could shed my skin." On June 5, the Museum of Science and Industry will open a new $35 million indoor exhibit of its famous World War II U-505 sub, captured by the U.S. Navy in 1944. But the museum's...