January 11 – Flooding and mudslides in the Brazilian state of Rio de Janeiro kills 903.
FebruaryFebruary 3 - The United Nations Food and Agriculture Organisation announces that world food prices have risen to a record high
MarchMarch 23 – Elizabeth Taylor, British-American actress died (b. 1932)
AprilApril 29 – An estimated two billion people] watch the wedding of Prince William, Duke of Cambridge and Catherine Middleton at Westminster Abbey in London.
MayMay 1 – U.S. President Barack Obama announces that Osama bin Laden, the founder and leader of the militant group Al-Qaeda, has been killed during an American military operation in Pakistan.
JuneJune 4 – Chile's Puyehue volcano erupts, causing air traffic cancellations across South America, New Zealand, Australia and forcing over 3,000 people to evacuate.
JulyJuly 7 – The world's first artificial organ transplant is achieved, using an artificial windpipe coated with stem cells.
AugustAugust 5 - NASA announces that its Mars Reconnaissance Orbiter captured photographic evidence of possible liquid water on Mars during warm seasons.
SeptemberSeptember 5 – India and Bangladesh sign a pact to end their 40-year border demarcation dispute
OctoberOctober 31 - Date selected by the UN as the symbolic date when global population reaches seven billion
NovemberNovember 26 – The Mars Science Laboratory rover Curiosity, the most elaborate Martian exploration vehicle to date, is launched from the Kennedy Space Center. It is slated to land on Mars on August 5, 2012.
DecemberDecember 15 – The United States formally declares an end to the Iraq War
Nobel PrizesChemistry – Dan Shechtman
Economics – Christopher A. Sims and Thomas J. Sargent
Literature – Tomas Tranströmer
Peace – Ellen Johnson Sirleaf, Leymah Gbowee and Tawakel Karman
Physics – Saul Perlmutter, Adam G. Riess, and Brian P. Schmidt
Physiology or Medicine – Bruce A. Beutler, Jules A. Hoffmann, and Ralph M. Steinman
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