1 of 2 | Robert Downey Jr. celebrates his Best Actor in a Supporting Role Oscar backstage at the 96th annual Academy Awards in Los Angeles on March 10, 2024. The actor turns 60 on April 4. File Photo ...

In 1975, Microsoft was founded by Bill Gates and Paul Allen. In 1983, the space shuttle Challenger lifted off on its inaugural mission . In 1991, Sen. John Heinz, R-Pa., and six others were killed in ...