Archaeologists, excavating the bison remains at Folsom, find an ancient spear point embedded in the skeleton - first proof of the Folsom culture

English typographer Eric Gill designs a type face without serifs, commissioned by Monotype and to be known as Gill Sans-Serif

Mae West is sentenced to eight days in gaol when Sex, written, produced and starred in by herself on Broadway, is judged to be obscene

US aviator Charles Lindbergh, in his single-engine plane Spirit of St Louis, flies solo across the Atlantic from New York to Paris

DuBose Heyward's novel Porgy, dramatized with a new title by himself and his wife Dorothy, has a great success on Broadway and in London

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

Mysterious German author B. Traven writes a novel, The Treasure of the Sierra Madre, about three Americans searching for a lost gold mine in Mexico

The Front Page, by Ben Hecht and Charles MacArthur, has its premiere on Broadway

The Lateran Treaty, between the Holy See and the state of Italy, establishes the Vatican City as a free state within the wider nation

An American Indian teenager, Ridgely Whiteman, finds the remains of a butchered mammoth near Clovis in New Mexico - first evidence of the Clovis culture

US author Marc Connelly's play Green Pastures has its premiere on Broadway

English pioneer aviator Amy Johnson makes a 19-day solo flight in a Gipsy Moth from Croydon (part of London) to Darwin, Australia

Swallows and Amazons is the first of Arthur Ransome's adventure stories for children

The airship R101, designed by a UK Air Ministry team, explodes on its maiden vogage, killing all but four of those on board

US inventor Richard Drew develops Scotch Brand Cellulose Tape, the world's first transparent tape

Six million Russian peasants die after being transported to agricultural labour camps in Siberia

The trilogy Mourning becomes Electra, Eugene O'Neill's transposition to New England of the Oresteia story, is performed in New York

US aviator Amelia Earhart lands in Ireland 15 hours after leaving Newfoundland, to become the first woman to fly solo across the Atlantic

US athlete Mildred 'Babe' Didrikson breaks four world records in one afternoon in Evanston, Illinois

Troops using bayonets and tear gas drive out of Washington the Bonus Army, a group of protesting unemployed war veterans

PhD student Ernst Ruska completes the first TEM (Transmission Electron microscope) at the Technological University of Berlin

Draughtsman Harry Beck, inspired by electrical circuits, produces a classic map of London's underground

The Hutus and Tutsis of Ruanda-Urundi are issued with racial identity cards by the Belgians

The Indian Reorganization Act restores tribal ownership of land in the US reservations

In Lillian Hellman's play The Children's Hour two teachers are maliciously accused of lesbianism by one of their pupils