A man sits outside a closed restaurant in downtown Mexico City April 30, 2009. Mexico began shutting down parts of its economy on Thursday to slow the spread of a new flu strain as officials urged increased worldwide precautions against an imminent pandemic.

REUTERS/Jorge Dan

A man takes a photo as members of the Republic of Singapore Air Force (RSAF) Black Knights aerobatic team form a heart shape using smoke trails during a performance at the Singapore Air Show in Singapore February 19, 2008.

REUTERS/Vivek Prakash

Sgt. William Olas Bee, a U.S. Marine from the 24th Marine Expeditionary Unit, has a close call after Taliban fighters opened fire near Garmser in Helmand Province of Afghanistan May 18, 2008. The Marine was not injured.

REUTERS/Goran Tomasevic

People look at waves crashing against the seawall in the northern Spanish city of Llanes January 24, 2009.

REUTERS/Eloy Alonso (SPAIN)

A Chuan opera actress performs at a theater in Suining, Sichuan province January 5, 2008.

REUTERS/Stringer

Richard Whitehead, a British disability activist who was born without legs, competes as he runs past a Lebanese soldier during the annual Beirut Marathon in Beirut, November 30, 2008. Thousands of people took part in the run which started in the Lebanese capital.

REUTERS/ Mohamed Azakir

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