Photos: Gates and the vibrating wristband

Microsoft Chairman Bill Gates tries on a vibrating wristband that is part of a system designed to help the blind and visually impaired navigate. The setup was developed by a team of Brazilian college students, including Ivan Cordeiro Cardim, center, and Carlos Eduardo Montiero Rodrigues, seen on the far right.

Gates looks on as a team of students from Virginia Commonwealth University--the Imagine Cup finalists from the United States--demonstrate their "PocketDoc" program for quick access to medical data. The students demonstrating the software are Brandon Saunders (left) and Brooks Hollar (right).