The document summarizes major world events that occurred in 2011, including the Arab Spring uprisings that overthrew authoritarian leaders in Tunisia, Egypt, Libya and Yemen; the Tohoku earthquake and tsunami in Japan; the marriage of Prince William and Kate Middleton; the killing of Osama bin Laden; terrorist attacks in Norway; train collisions in China; the European debt crisis; riots in London; floods in Thailand; and Hurricane Washi in the Philippines.