Norwegian ethnographer and adventurer Thor Heyerdahl and his five man crew set out from Peru on a giant balsa wood raft called the Kon-Tiki in order to prove that Peruvian natives could have settled Polynesia. After a 101 day, 4,300 mile (8,000 km) journey, Kon-Tiki smashes into the reef at Raroia in the Tuamotu Islands on August 7, 1947, thus demonstrating that it is possible for a primitive craft to survive a Pacific crossing.

After two days of rumors and denials the Soviet Union admits there was an accident at the Chernobyl nuclear power plant in Ukraine. Reactor number four had suffered a meltdown, sending a plume of radioactive fallout into the atmosphere and over an extensive geographical area. Today the abandoned radioactive area surrounding Chernobyl is rife with local wildlife and has been converted into a wildlife sanctuary, one of the largest in Europe.

Italian dictator Benito Mussolini, his mistress Clara Petacci, and fifteen supporters are arrested by Italian partisans in Dongo, Italy while attempting to escape the region in the wake of the collapse of Mussolini’s fascist government. The next day, Mussolini and his mistress are both executed, along with most of the members of their group. Their bodies are then trucked to Milan where they are hung upside down on meathooks from the roof of a gas station, then spat upon and stoned until they are unrecognizable.

The Geheime Staatspolizei, aka Gestapo, the official secret police force of Nazi Germany, is established. It begins under the administration of SS leader Heinrich Himmler in his position as Chief of German Police, but by 1939 is administered by the Reichssicherheitshauptamt, or Reich Main Security Office, and is a feared entity in every corner of Germany and beyond.

In Spain during the Spanish Civil War, the Basque town of Guernica is bombed by the German Luftwaffe, resulting in widespread destruction and casualties. The Basque government reports 1,654 people killed, while later research suggests far fewer deaths, but regardless, Guernica is viewed as an example of terror bombing and other countries learn that Nazi Germany is committed to that tactic. The bombing also becomes inspiration for Pablo Picasso, resulting in a protest painting that is not only his most famous work, but one the most important pieces of art ever produced.

In Detective Comics #27, DC Comics publishes its second major superhero, Batman, who becomes one of the most popular comic book characters of all time, and then a popular camp television series starring Adam West, and lastly a multi-million dollar movie franchise featuring such leads as Michael Keaton, George Clooney, Val Kilmer, Robert Pattinson, and Christian Bale.

British scientists James D Watson and Francis Crick publish an article detailing their discovery of the existence and structure of deoxyribonucleic acid, or DNA, in Nature magazine. Their findings answer one of the oldest and most fundamental questions of biology, that of how living things reproduce themselves.