Image Day - AquaJellys

'AquaJellys' swim inside the Festo stand, at the "Hannover Messe" trade fair. The robotic jellyfishes with adaptive behaviour consist of a sphere-shaped body with eight electrically-driven tentacles for propulsion. The world's leading fair for industrial technology, opened to the public on Monday and runs till April 25.

"Hello, World!"

A worker fixes a welcome-sign at the IBM booth at the CeBIT in Hanover, northern Germany, on Saturday, March 1, 2008. The world's biggest IT fair opens its doors on Tuesday March 4, and runs through to Sunday March 9, 2008.

> AP Images