elections on June 4. April 19 Central Park jogger case: Trisha Meili is seriously assaulted and raped whilst jogging in New York City's Central Park; the convictions of five teenagers for the crime are vacated in 2002 (the jogger's identity remains secret for years, hence she is referred to as the "Central Park Jogger"). The USS Iowa turret explodes on the U.S. battleship Iowa, killing 47 crew members. April 20 – NATO debates modernising short range missiles; although the US and UK are in favour, West German Chancellor Helmut Kohl obtains a concession deferring a decision. April 21 – Students from Beijing, Shanghai, Xi'an and Nanjing begin protesting in Tiananmen Square in Beijing. April 23 – Zaid al-Rifai resigns as Prime Minister of Jordan in the wake of riots over government-imposed price hikes that began on April 18. April 25 Noboru Takeshita resigns as Prime Minister of Japan in the wake of a stock-trading scandal. Motorola introduces the Motorola MicroTAC personal cellular telephone, the world's smallest mobile phone at this time. April 26 Sultan Azlan Muhibbudin Shah ibni Almarhum Sultan Yusuff Izzudin Shah Ghafarullahu-lahu, Sultan of Perak, becomes the 9th Yang di-Pertuan Agong of Malaysia, succeeding Baginda Almutawakkil Alallah Sultan Iskandar Al-Haj ibni Almarhum Sultan Ismail. Zaid ibn Shaker succeeds Zaid al-Rifai as Prime Minister of Jordan. The Daulatpur–Saturia tornado, the deadliest tornado ever recorded, kills an estimated 1,300 people in the Dhaka Division of Bangladesh. April 27 – A major demonstration occurs in Beijing as part of the 1989 Tiananmen Square protests. May May Transhumanism: Genetic modification of adult human beings is tried for the first time, a gene tagging trial. The Soviet Union issues its first Visa card in a step to digitalise its banking system. May 1 – Andrés Rodríguez, who seized power and declared himself President of Paraguay during a military coup in February, wins a landslide victory at a general election marked by charges of fraud. May 2 The first crack in the Iron Curtain: Hungary dismantles of barbed wire fencing along the border with Austria. The coalition government of Prime Minister of the Netherlands Ruud Lubbers collapses in a dispute about a pollution cleanup plan. May 3 – Cold War: Perestroika – The first McDonald's restaurant in the USSR begins construction in Moscow. It will open on January 31, 1990. May 4 – Oliver North is convicted in the United States on charges related