On January 28, 1986, the tenth mission of the space shuttle Challenger ended in tragic disaster. We remember the seven astronauts who lost their lives that day, including Christa McAuliffe, who was chosen by NASA to pioneer its Teacher in Space program.

Learn about the Iran-Contra Affair under President Reagan who secretly supported an anti-Communist group in Nicaragua and funneled weapons to Iranian terrorists in exchange for American hostages. Discover how Lt. Col. Oliver North was found guilty.

As the Civil War teetered, Lincoln weighed the Emancipation Proclamation—an audacious act that reshaped the nation’s course.

Doris Kearns Goodwin shares how President Lyndon B. Johnson, despite fierce resistance, rose to meet a defining moment in U.S. history.