From left, clockwise: The first Space Shuttle, Columbia, lifts off in 1981; US president Ronald Reagan and Soviet leader Mikhail Gorbachev become less aggressive towards each other, leading to the end of the Cold War; The fall of the Berlin Wall in 1989; In 1981, the IBM Personal Computer is released; In 1985, the Live Aid concert is held in order to help stop the famine in Ethiopia during the time Mengistu Haile Mariam ruled the country; Ukraine and much of the world is filled with radioactive debris from the 1986 Chernobyl disaster; The Iran–Iraq War kills over one million people.