Japan's Emperor Akihito (3R), together with Empress Michiko (2R) and Crown Prince Naruhito (R), look at a life-size replica of a mammoth, on display at the 2005 World Exposition in Nagakute, near Nagoya, central Japan March 23, 2005. The 185-day Expo will open to public on March 25. (REUTERS)

Information robot 'Actroid,' work as an official Aichi Expo 2005 multilingual receptionist at West Gate during a press preview of the world fair in Nagakute, central Japan. (AP Photo)

The 2005 World Exposition's Nagakute area is seen in this aerial view in Nagoya, central Japan. (REUTERS)

Visitors look at the Earth Room, the world's first 360-degree all-sky image system, during a media preview at the Japan Pavilion Nagakute of the 2005 World Exposition in Nagoya, central Japan. (REUTERS)

A man rides the Toyota Motor's one-seater 'i-unit' vehicle in a test drive at the Toyota Group pavilion at the 2005 World Exposition. (REUTERS)

An officer from the Exhibition Department of Chicago's Field Museum, puts final touches on the skull of the world's largest Tyrannosaurus Rex, Sue, on display at the Dinosaur Expo 2005 at the National Science Museum in Tokyo.