Microsoft Windows 1980's William "Bill" Gates Ronald Reagan George Bush Christa McAuliffe 1980 - Bill Gates licenses MS-DOS to IBM August 1, 1981 - MTV premieres 1984 - The HIV virus is discovered 1986 - Iran-Contra Affair begins November 9, 1989 - The fall of the Berlin Wall December 1989 - First test-tube baby is born January 28, 1986 - Challenger shuttle explodes Photo of the Berlin Wall courtesy of Chris De Witt, chris@dewitt.photographer.org.uk Poster of Human Genome Project, courtesy of the U.S. Department of Energy's Human Genome Program, http://www.ornl.gov/hgmis Jose Sarabia