1937: Some 300 people, mostly children, were killed in a gas explosion at a school in New London, Texas.
1938: Mexican President Lazaro Cardenas nationalized his country's petroleum reserves and took control of foreign-owned oil facilities.
1962: France and Algerian rebels signed the Evian Accords, a cease-fire agreement which took effect the next day, ending the Algerian War.
1963: The U.S. Supreme Court, in Gideon v. Wainwright, ruled unanimously that state courts were required to provide legal counsel to criminal defendants who could not afford to hire an attorney.
1965: The first spacewalk took place as Soviet cosmonaut Alexei Leonov went outside his Voskhod 2 capsule, secured by a tether.
2009: Actress Natasha Richardson, 45, died at a New York hospital two days after suffering a head injury while skiing in Canada.