The Space Shuttle Discovery with the International Space Station's robotic arm in the foreground approaches the orbiting laboratory for docking in this still image taken from NASA TV, Feb 26, 2011. [Photo/Agencies]

A sunset view of an offshore floating oil platform along the Tirreno sea coast in front of the city of Civitavecchia, 70km (43 miles) north of Rome, Feb 26, 2011. Brent oil rose in volatile trade on Friday to hold above $112 a barrel but below Thursday's 2-1/2-year highs after Saudi Arabia raised output to calm fears of supply disruptions sparked by Libya's uprising. [Photo/Agencies]