April 28th – May 1st
April 28, 2001 – American businessman Dennis Tito became the first space tourist when he was launched into orbit aboard a Russian supply mission to the International Space Station; he paid approximately $20 million for the six-day trip.
April 29, 2018 – The animated TV series The Simpsons aired its 636th episode, surpassing Gunsmoke (1955–75) to become the longest-running scripted prime-time show in the United States.
April 30, 1939 – The National Broadcasting Company made the first public television broadcast in the United States, at the New York World’s Fair.
April 30, 1897 – English physicist J.J. Thomson announced that he had discovered the electron, which helped revolutionize the knowledge of atomic structure; he later was awarded the Nobel Prize for Physics.
May 1, 1941 – Orson Welles’s Citizen Kane, considered by many critics to be the greatest film ever made, premiered in New York City.