Martin Luther King Jr. is assassinated by James Earl Ray at a motel in Memphis, Tennessee. Date: April 4, 1968 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1968 📅 On This Day (Today)

Dr. Denton Cooley implants the first temporary artificial heart. Date: April 4, 1969 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1969 📅 On This Day (Today)

A Lockheed C-141 Starlifter, dubbed the Hanoi Taxi, makes the last flight of Operation Homecoming. Date: April 4, 1973 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1973 📅 On This Day (Today)

The Twin Towers of the World Trade Center in New York City are officially dedicated. Date: April 4, 1973 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1973 📅 On This Day (Today)

Vietnam War: A United States Air Force Lockheed C-5A Galaxy transporting orphans, crashes near Saigon, South Vietnam shortly after takeoff, killing 172 people. Date: April 4, 1975 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1975 📅 On This Day (Today)

Microsoft is founded as a partnership between Bill Gates and Paul Allen in Albuquerque, New Mexico. Date: April 4, 1975 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1975 📅 On This Day (Today)

Southern Airways Flight 242 crashes in New Hope, Paulding County, Georgia, killing 72. Date: April 4, 1977 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1977 📅 On This Day (Today)

Prime Minister Zulfikar Ali Bhutto of Pakistan is executed. Date: April 4, 1979 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1979 📅 On This Day (Today)

Iran–Iraq War: The Islamic Republic of Iran Air Force mounts an attack on H-3 Airbase and destroys about 50 Iraqi aircraft. Date: April 4, 1981 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1981 📅 On This Day (Today)

Space Shuttle program: Space Shuttle Challenger makes its maiden voyage into space on STS-6. Date: April 4, 1983 Read more on Wikipedia → 📅 Other events on April 4 📅 Events on this day in 1983 📅 On This Day (Today)