Associated Press

On April 20, 1916, the Chicago Cubs played their first game at Wrigley Field (then known as Weeghman Park).

In 1971, the Supreme Court unanimously upheld the use of busing to achieve racial desegregation in schools.

In 1999, the Columbine High School massacre took place in Colorado as two students shot and killed 12 classmates and one teacher before taking their own lives.

In 2010, an explosion on the Deepwater Horizon oil platform, leased by BP, killed 11 workers and caused a blowout that began spewing an estimated 200 million gallons of crude into the Gulf of Mexico.

In 2020, the Centers for Disease Control and Prevention said reports of accidental poisonings from cleaners and disinfectants were up about 20% in the first three months of the year.