Before it closes September 25, get thee to the 2005 World Exposition in Aichi Prefecture, near Nagoya, Japan. Themed “Nature’s Wisdom,” the 427-acre expo has a Forest Zone with hiking, a Fun Zone with interactive robots, and plenty of international exhibits. The U.S. Pavilion salutes the science of Benjamin Franklin — and on his 300th birthday, no less. And, with American Airlines’ new nonstop service from Chicago O’Hare to Nagoya, you’ll be there in a flash.