Visitors look at an electric car during the "Hannover Messe" industrial trade fair in Hanover, Germany, on April 20, 2009. [Xinhua]

Visitors look at a shopping-guide robot during the "Hannover Messe" industrial trade fair in Hanover, Germany, on April 20, 2009. The shopping-guide robot, which is said to be the first of its kind in the world, was designed by German scientists. It is a 1.5-meter tall, 75 kg weight robot that can help shoppers shopping. [Xinhua]