The 94th day of the year. (9+4=13)
1944 – World War II: First bombardment of oil refineries in Bucharest by Anglo-American forces kills 3000 civilians
1967 – Martin Luther King, Jr. delivers his "Beyond Vietnam: A Time to Break Silence" speech in New York City's Riverside Church.
1968 – Apollo program: NASA launches Apollo 6.
1969 – Dr. Denton Cooley implants the first temporary artificial heart.
1973 – The World Trade Center in New York is officially dedicated
1975 – Microsoft is founded as a partnership between Bill Gates and Paul Allen in Albuquerque, New Mexico
1983 – Space Shuttle Challenger makes its maiden voyage into space
A bunch of important people were born on this day, lots of american and French ones, Robert Downey, Jr. being one of them.
These and many more happened on the 4th of April. And many more yet to come.
Mine was April 4 2007.
source: Wikipedia :)