The document provides a timeline of notable events from the 1980s, including the marketing of the first IBM PC computer in 1981, John Lennon being murdered in New York in 1980, Michael Jackson's Thriller album becoming the best-selling of all time in 1982, the first woman walking in space in 1984, the worldwide release of Michael Jackson's music video for "Thrilller" in 1983, an earthquake in Mexico City killing over 35,000 people in 1985, Canadian sprinter Ben Johnson being stripped of his gold medal at the 1988 Seoul Olympics for doping, and the fall of the Berlin Wall and development of the World Wide Web in 1989.