After six years of work and planning, EXPO 2015 opens in Milan in less than five weeks, and you can almost hear the organizers’ sighs of relief as work on the pavilions is being completed, and the goal of selling 10 million tickets before its official opening May 1 looms within sight. Organizers of this ambitious world’s fair on the theme “Nourish the Planet, Energy for Life” report that distributors, travel agencies worldwide and on-line booking agencies have already acquired 8.5 million tickets.