364: Roman Emperor Valentinian I appoints his brother Flavius Valens co-emperor

1854: Great Britain and France declare war on Russia, expanding the Crimean War

1910: First seaplane takes off from water under its own power, piloted by Henri Fabre from the Étang de Berre lagoon in Martigues, France

1939: Spanish Civil War ends as Madrid falls to the Nationalists headed by Francisco Franco

1946: US State Department releases the Acheson-Lilienthal Report, outlining a plan for the international control of nuclear power

1964: First true pirate radio station, England’s Radio Caroline begins regular transmission at noon from the MV Caroline off the coast of Suffolk

1979: A partial meltdown at the Three Mile Island nuclear plant in the US results in the release of radioactive gas and iodine into the atmosphere, but no deaths

Source: Onthisday.com