Queen Elizabeth II (pictured) of the United Kingdom makes the first-ever state visit by a British monarch to the Republic of Ireland.
Space Shuttle Endeavour launches on its final mission, delivering the Alpha Magnetic Spectrometer for installation on the International Space Station.
At least 12 Arab protesters are killed during Nakba Day protests and marches on Israel's borders.
Kenyan long-distance runner Samuel Wanjiru, who won the Athletics at the 2008 Summer Olympics – men's marathon at the 2008 Summer Olympics, dies at the age of 24.
Dominique Strauss-Kahn, head of the International Monetary Fund, is held without bail in New York City on charges of sexual assault.
