Also Within This Year in History:
1970
As the Vietnam War expanded into Cambodia, anti-war rallies flared at home; at Kent State University in Ohio, National Guardsmen killed four unarmed student protesters, shocking the nation. Americans held their breath as NASA scrambled to bring Apollo 13 astronauts home safely after their aborted moon mission. Some 20 million people celebrated the first Earth Day, rock icons Janis Joplin and Jimi Hendrix both died of drug overdoses at age 27, and the Beatles called it quits.