National Public Radio makes its on-air debut; The Columbine High School massacre takes place.

The American Revolutionary War begins; A truck bomb destroys the Alfred P. Murrah Federal Building in Oklahoma City, Okla., killing 168 people; the 51-day siege at the Branch Davidian compound

The Mueller Report is released; Superman, AKA “The Man of Steel,” makes his debut as the first issue of Action Comics goes on sale.

Barbara Bush, first lady and matriarch of the Bush family, dies; Metro-Goldwyn-Mayer is founded; Daffy Duck makes his debut.

Martin Luther King Jr. writes his “Letter from Birmingham Jail”; Charlie Chaplin is born; rap star Kendrick Lamar is awarded the Pulitzer for music.

Jackie Robinson, baseball’s first Black Major League player, makes his official debut with the Brooklyn Dodgers.

Abraham Lincoln is shot; RMS Titanic hits an iceberg.

Thomas Jefferson is born; Right-to-die advocate Dr. Jack Kevorkian is sentenced in Pontiac, Mich. to 10 to 25 years in prison for second-degree murder.

FDR dies; The Salk vaccine against polio was declared safe and effective; Martin Luther King Jr. is arrested and jailed in Birmingham, Ala.

Frank Sinatra records the song “Strangers in the Night” for his label, Reprise Records; Apollo 13 blasts off on its ill-fated mission to the moon; WikiLeaks founder Julian Assange is arrested