April 20, 1916 (103 years ago)
•The Chicago Cubs play their first game at Weeghman Park (currently Wrigley Field), defeating the Cincinnati Reds 7-6 in 11 innings

April 20, 1926 (93 years ago)
•Western Electric and Warner Bros. announce Vitaphone, a process to add sound to film.

April 20, 1999 (20 years ago)
•Eric Harris and Dylan Klebold kill 13 people and injure 24 others before committing suicide at Columbine High School in Jefferson County, Colorado.

April 20, 2008 (11 years ago)
•Danica Patrick wins the Indy Japan 300 becoming the first female driver in history to win an Indy car race.