Dancers perform during the opening ceremony of the 10th Special Olympics World Winter Games in Pyeongchang, South Korea. (AP)

Uais Khan, 62, shovels sand and salt into an oven at a factory in Rawalpindi, Pakistan. Heated sand and salt are later used to cook corn overnight, before the corn is sold as a popular street food dish. (Reuters)

Serbia’s Novak Djokovic kisses his trophy after defeating Britain’s Andy Murray in the men’s final at the Australian Open tennis championship in Melbourne, Australia. (AP)

Egyptian protesters try to tear down a cement wall built to prevent them from reaching parliament and the Cabinet building near Tahrir Square in Cairo. (AP)

Steam from a heating plant rises as at temperatures of -14 degrees Celsius (-6.8 degrees Fahrenheit) are recorded in Minsk, Belarus. (AP)

Cossack cadets toss their rifles as they practice for an upcoming performance to mark the130th anniversary of the founding of the Novocherkassk Cossack cadet corps, outside a cathedral in the southern Russian city of Novocherkassk. (Reuters)

President Barack Obama is officially sworn-in by Chief Justice John Roberts in the Blue Room of the White House during the 57th Presidential Inauguration in Washington, D.C. Next to Obama are First Lady Michelle Obama, holding the Robinson Family Bible, and daughters Malia and Sasha. (AP)

The Inaugural Parade begins along Pennsylvania Avenue following the second inauguration of U.S. President Barack Obama in Washington, D.C. (AFP)