raids the Libyan Ouadi Doum airbase in northern Chad. Mário Soares wins the second round of the Portuguese presidential election. February 17 – The Single European Act is signed. February 19 The Soviet Union launches the Mir space station. The United States Senate approves a treaty outlawing genocide. February 22 – The People Power Revolution begins in the Philippines to remove President Ferdinand Marcos from office. February 25 The 27th Congress of the Communist Party of the Soviet Union opens in Moscow. The General Secretary Mikhail Gorbachev introduces the keywords of his mandate to the audience: Glasnost and Perestroika. People Power Revolution: President Ferdinand Marcos of the Philippines is ousted from power and goes into exile in Hawaii after 20 years of dictatorial rule; Corazon Aquino becomes the first Filipino woman president and forms an interim government with Salvador Laurel becoming her Vice-president and Prime Minister. A three-day riot begins in Cairo, Egypt when around 25,000 conscripts of the Central Security Forces (CSF), staged protests in and around the city. Three luxury hotels, several nightclubs, restaurants and cars were looted and burned in the tourist districts near the Pyramids over several days. The riot became known as the Egyptian Conscripts Riot. At least 25 people died during the first day in Cairo, and an estimated 8,000 people, mostly conscripts in regions outside the city, were killed in total. February 27 – The United States Senate allows its debates to be televised on a trial basis. February 28 – Swedish Prime Minister Olof Palme is shot to death on his way home from the cinema in Stockholm, Sweden. March March 1 – Olof Palme's deputy Ingvar Carlsson becomes acting Prime Minister of Sweden. He is elected Prime Minister by the Swedish Riksdag on March 15. March 3 – The first paper is published describing the atomic force microscope invented the previous year by Gerd Binnig, Calvin Quate and Christopher Berger. March 8 – The Japanese Suisei probe flies by Halley's Comet, studying its UV hydrogen corona and solar wind. March 9 – United States Navy divers find the largely intact but heavily damaged crew compartment of the Space Shuttle Challenger; the bodies of all seven astronauts are still inside. March 13 – In a Black Sea incident, American cruiser USS Yorktown and the destroyer USS Caron, claiming the right of innocent passage, enter the Soviet territorial waters near the southern Crimean