(March 19) -- In 1965, a 14-year-old Canadian kid started building a chain of chewing gum wrappers, just like millions of other kids. The only difference between Gary Duschl and your typical kid is that he never stopped, and his chain is now 12 miles long -- 42 times the height of the Empire State Building, twice the height of Mount Everest and long enough to cross 210 football fields. "If you were to get in a car and drive 60 mph from one end of the chain, it would take you 12 minutes to get to the other," says...