The History Channel
* On April 23, 1954, Hank Aaron hits the first home run of his Major League Baseball career. Twenty years later, Aaron became baseball’s new home-run king when he broke Babe Ruth’s long-standing record of 714 career homers.
* On April 22, 1970, Earth Day, an event to increase public awareness of the world’s environmental problems, is celebrated in the United States for the first time. Millions of Americans participated in rallies, marches and educational programs.
* On April 25, 1983, the Soviet Union releases a letter that Russian leader Yuri Andropov wrote to Samantha Smith, an American fifth-grader from Manchester, Maine, inviting her to visit his country. Andropov’s letter came in response to a note Smith had sent him in December 1982, asking if the Soviets were planning to start a nuclear war.