Werner Heisenberg publishes his Uncertainty Principle, declaring that it is impossible to define precisely the position and momentum of a sub-atomic particle

Stalin expels from the Communist party his main opponents, Kamenev, Zinoviev and Trotsky

Mussolini's treaty with Ahmed Zogu gives Fascist Italy a dominant position in Albania

Bertolt Brecht and Kurt Weill write Mahagonny Songspiel for the Baden-Baden music festival

Henry Williamson wins a wide readership with Tarka the Otter, a realistic story of the life and death of an otter in Devon

Irish Free State president Kevin O'Higgins is murdered by members of the IRA on his way to mass

Hermann Hesse publishes a mystical novel, Steppenwolf, based on the concept of a double personality

In Being and Time German philosopher Martin Heidegger makes an existentialist case with Dasein ('Being There') as the central theme

Anglo-Irish author Elizabeth Bowen publishes her first novel, The Hotel

De Valera and his party, the Fianna Fáil, finally take their seats in the Dáil

Virginia Woolf uses a Hebridean holiday as the setting for her narrative in To The Lighthouse

Isadora Duncan dies in Nice when her scarf tangles in the wheel of a Bugatti sports car, breaking her neck

Austrian zoologist Karl von Frisch demonstrates that bees communicate the whereabouts of food by means of a dance

Leos Janacek's Glagolitic Mass has its first performance in his home town, Brno

Stuttgart's Weissenhofsiedlung, designed by Mies van der Rohe, le Corbusier, Gropius and others, sets a defining standard for International Modernism

Stanley Spencer begins his murals in the Memorial Chapel for Henry Sandham at Burghclere, in Hampshire

Luis Buñuel and Salvador Dali make Un Chien andalou, a surrealist film specifically designed to shock

Le Corbusier and other modernist architects set up the Congrès Internationaux d'Architecture Moderne (CIAM)

Ninette De Valois creates her first ballet, Les Petits Riens, at the Old Vic

English psychologist Henry Havelock Ellis completes a thirty-year project, his 7-volume Studies in the Psychology of Sex

English sculptor Henry Moore receives his first public commission, for the headquarters of London Underground

Scottish bacteriologist Alexander Fleming accidentally discovers a mould that selectively kills bacteria, and calls it penicillin

W.B. Yeats's new volume of poems, The Tower, includes 'Sailing to Byzantium'

Marcel Breuer, working at the Bauhaus, designs the classic version of his tubular-steel cantilever chair their homesr

Maxim Gorky returns to the USSR to a rapturous reception after seven years abroad