June 11 & 12, 2011 (16 images)

Duchess of Cambridge and the Duchess of Cornwall wave to the crowds from the royal open carriage after the "Trooping the Colour" at Horseguards Parade to commemorate the Queen's official birthday in London on Saturday June 11 2011. UPI/Hugo Philpott

Runners begin the annual Susan G. Komen St. Louis Race for the Cure in St. Louis on June 11, 2011. More than $2.3 million was raised with seventy-five percent of the money staying in St. Louis to fund screening, treatment, education and support programs. St. Louis has been tapped as the largest Koman Race in the United States with over 64 thousand people participating. UPI/Bill Greenblatt

This 19,000-cubic-foot, netted gas balloon, seen partially inflated in near the US Capitol in Washington, DC, on June 11, 2011, was built in 1941 and is very similar in operation and size to the balloons used by Thaddeus Lowe in June 1861 to demonstrate to President Lincoln how a gas-filled balloon might be used to spy on the enemy-thus helping the Union Army and establishing the earliest "air force." UPI/Roger L. Wollenberg

Members of the public ride naked through the streets of London on "World Naked Bike Ride Day" to highlight issues of global importance in London, Saturday May 11 2011. UPI/Hugo Philpott