Knut Pedersen Hamsun awarded the Nobel Prize in Literature "for his monumental work, Growth of the Soil".

Women gain the right to vote in the United States.

The Russian Civil War ends in victory for the Bolsheviks.

Warren Harding becomes twenty-ninth president of the United States.

Anatole France awarded the Nobel Prize in Literature "in recognition of his brilliant literary achievements, characterized as they are by a nobility of style, a profound human sympathy, grace, and a true Gallic temperament".

Fossil mammal expert William Diller Matthew suggests dinosaurs were driven extinct by mountain building, continental uplift and replacement by mammals.

Miners at Broken Hill in the British colony of Northern Rhodesia, Africa, find leg bones and a skull that will later be classified as Homo heidelbergensis.

James Joyce publishes Ulysses and T. S. Eliot publishes The Wasteland, two significant works in the new literary movement called modernism.

Jacinto Benavente awarded the Nobel Prize in Literature "for the happy manner in which he has continued the illustrious traditions of the Spanish drama".

The Dyer Anti-Lynching Bill (first introduced by St. Louis congressman Leonidas Dyer in 1918), making lynching a federal offense, passes the US House of Representatives but fails in the US Senate.

Kodak makes 35 mm panchromatic motion picture film available as a regular stock.

Lillian V. Morgan discovers attached-X chromosomes in Drosophila.

The American Museum of Natural History begins a series of excavations in central Mongolia, led by Roy Chapman Andrews. Hoping to find fossil human remains, Chapman's team instead finds dinosaurs.

Harding dies in office.

Calvin Coolidge becomes thirtieth president of the United States.

William Butler Yeats awarded the Nobel Prize in Literature "for his always inspired poetry, which in a highly artistic form gives expression to the spirit of a whole nation".

Integrated Circuit Co-Inventor Jack Kilby is Born

Harold Edgerton invents the xenon flash lamp for strobe photography.

The 16 mm amateur motion picture format is introduced by Kodak. Their Cine-Kodak camera uses reversal film and all 16 mm is on an acetate (safety) base.

Adolf Hitler's attempted coup d'état (the Beer Hall Putsch) in Munich fails. Hitler is imprisoned for eight months

A. E. Boycott and C. Diver describe "delayed" Mendelian inheritance controlling the direction of the coiling of the shell in the snail Limnea peregra. A. H. Sturtevant suggests that the direction of coiling of the Limnea shell is determined by the character of the ooplasm, which is in turn controlled by the mother's genotype.

C. B. Bridges discovers chromosomal translocations in Drosophila.

Jesuit priests Émile Lincent and Pierre Teilhard de Chardin discover ancient stone tools at Shuidonggou, China. Their discoveries resemble those of the Middle Paleolithic industry in Europe.

Wladyslaw Stanislaw Reymont awarded the Nobel Prize in Literature "for his great national epic, The Peasants".

C-T-R becomes IBM

Gandhi undertakes his 21-day fast to protest feuds between Hindus and Muslims in India.

Winifred Goldring publishes a description of a fossil forest discovered during excavations for the Gilboa Dam. Dating from the Devonian Period, the site will become known as the world's oldest fossil forest.

The film adaptation of Sir Arthur Conan Doyle's dinosaurs-and-cavemen fantasy The Lost World premieres.

George Bernard Shaw awarded the Nobel Prize in Literature "for his work which is marked by both idealism and humanity, its stimulating satire often being infused with a singular poetic beauty".

On September 9, Ossian Sweet, a Detroit physician, is arrested for murder after he and his family kill a member of a white mob while defending their home. The Sweet family is represented by Clarence Darrow and they are acquitted of the charge.

First patent for a transistor in Canada lodged

January 1925 Douglas Engelbart is Born

Supercomputer Pioneer Seymour Cray is Born

The Leica I 35mm still camera was introduced at the Leipzig Spring Fair in Germany, thereby launching the 35mm format for portable photography.

Hitler reorganizes the Nazi party and publishes volume one of Mein Kampf.

Ibn Saud of Najd conquers Hijaz and forms Saudi Arabia.

Tennessee schoolteacher John Thomas Scopes is tried for teaching evolution in the famous "Scopes Monkey Trial." Two-time presidential candidate William Jennings Bryan leads the prosecution. Labor lawyer Clarence Darrow leads the defense and goads Bryan into declaring that humans are not mammals. The conviction will be overturned on a technicality, and the anti- evolution law will remain on the books for decades.

A. H. Sturtevant analyzes the Bar-eye phenomenon in Drosophila and discovers position effect.

Francis Turville-Petre finds Galilee Man, the first fossil hominid discovered in Western Asia. The fossil will later be dated to more than 250,000 years old, and classified as neither modern Homo sapiens nor Neanderthal.

Raymond Dart publishes a description of the "Taung Child," a hominid child's skull from Africa. He classifies it as Australopithecus africanus and concludes that it's the missing link between humans and apes.

Grazia Deledda awarded the Nobel Prize in Literature "for her idealistically inspired writings which with plastic clarity picture the life on her native island and with depth and sympathy deal with human problems in general".

Kodak introduces its 35 mm Motion Picture Duplicating Film for duplicate negatives. Previously, motion picture studios used a second camera alongside the primary camera to create a duplicate negative.

Hirohito takes over the Japanese throne upon the death of his father, Yoshihito.

Mussolini takes total control in Italy, banning all opposition.

A. H. Sturtevant finds the first inversion in Drosophila.

Harvard geology professor William Morris Davis publishes a paper entitled The Value of Outrageous Geological Hypotheses warning against quick dismissal of new ideas. The paper will become famous.

Henri Bergson awarded the Nobel Prize in Literature "in recognition of his rich and vitalizing ideas and the brilliant skill with which they have been presented".

Bernard O. Dodge initiates genetic studies on Neurospora.

H. J. Muller reports the artificial induction of mutations in Drosophila by x-rays.

J. B. S. Haldane suggests that the genes known to control certain coat colors in various rodents and carnivores may be evolutionarily homologous.

Excavations in Kent's Cavern in southern England turn up a fragment of a human upper jaw, roughly 43,000 years old. Arthur Keith will provisionally identify it as anatomically modern human, and this finding will be confirmed in a 2011 study.

Johns Hopkins University biologist Raymond Pearl publishes an article entitled "Why Lazy People Live the Longest." He will expand on this rate- of-living hypothesis in a book the next year, arguing that a faster rate of biochemical reactions leads to a shorter lifespan. This hypothesis is quickly dismissed and generally considered buncombe. Later, however, Donald Trump, the 45th president of the United States will be discovered to hold similar views.

Sigrid Undset awarded the Nobel Prize in Literature "principally for her powerful descriptions of Northern life during the Middle Ages".

Introduction of 80-columns card format

Frederick Griffith discovers type-transformation of pneumococci. This lays the foundation for the work of Avery, MacLeod, and McCarthy (1944).

L. J. Stadler reports the artificial induction of mutations in maize, and demonstrates that the dose-frequency curve is linear.

In a letter to Science, Louise Sudbury states that fossil plants, Cycadeoidea Etrusca, were collected by Etruscans over 4,000 years ago.

In trying to piece together a Burgess Shale organism over 500 million years old, Danish zoologist K. L. Henriksen glues an Anomalocaris appendage to a Tuzoia carapace to make what he thinks is a reasonable looking shrimp-like animal. This mistaken interpretation will persist for years.

John Henry Pull, a postman and amateur archaeologist, finds fossil urchins in two separate Neolithic burial sites. His efforts to publish on his findings, however, will be thwarted due to his pedestrian background.

Wings wins Academy Award for best picture. The silent film about World War I soldiers and their girls back home provided intimacy and spectacle, including aviation sequences that are still impressive. For the first six ceremonies, the Academy did not use the calendar year, which is why the dates are a little confusing.

Surrealism goes to the movies, with Un Chien Andalou (An Andalusian Dog), a 1929 silent surrealist short film by the Spanish director Luis Buñuel and artist Salvador Dalí. It was Buñuel's first film and was initially released in 1929 with a limited showing at Studio des Ursulines in Paris, but became popular and ran for eight months. Un Chien Andalou has no plot in the conventional sense of the word. The chronology of the film is disjointed, jumping from the initial "once upon a time" to "eight years later" without the events or characters changing very much. It uses dream logic in narrative flow that can be described in terms of then-popular Freudian free association, presenting a series of tenuously related scenes. The idea for the film began when Buñuel was working as an assistant director for Jean Epstein in France. Buñuel told Dalí at a restaurant one day about a dream in which a cloud sliced the moon in half "like a razor blade slicing through an eye". Dalí responded that he'd dreamed about a hand crawling with ants. Excitedly, Buñuel declared: "There's the film, let's go and make it.'" They were fascinated by what the psyche could create, and decided to write a script based on the concept of suppressed human emotions. In deliberate contrast to the approach taken by Jean Epstein and his peers, which was to never leave anything in their work to chance, with every aesthetic decision having a rational explanation and fitting clearly into the whole, Bu uel made clear throughout his writings that, between Dalí and himself, the only rule for the writing of the script was: "No idea or image that might lend itself to a rational explanation of any kind would be accepted." Buñuel also stated: "Nothing, in the film, symbolizes anything. The only method of investigation of the symbols would be, perhaps, psychoanalysis."

Thomas Mann awarded the Nobel Prize in Literature "principally for his great novel, Buddenbrooks, which has won steadily increased recognition as one of the classic works of contemporary literature".

Herman Hollerith Died

Herbert Hoover becomes thirty-first president of the United States.

Black Tuesday in New York signals the beginning of a worldwide economic crisis and the beginning of the Great Depression, when the US stock exchange collapses, losing $26 billion in value.

Davidson Black announces the find of Sinanthropus pekinensis, or Peking Man, discovered at Zhoukoudian, China. Over the next several years, five nearly-complete skulls will be recovered from the same site. Peking Man will be lost, however, during World War II.

Estonian paleobiologist Alexander Audova publishes a paper rejecting racial senility as the cause of dinosaur extinction and instead pointing to environmental change.

The Broadway Melody wins Academy Award for best picture. It was the first talkie to win an Oscar, with the movie's publicity bragging All talking! All dancing! All singing! That novelty made it a sensation, but the film is pretty creaky in modern times. There were no nominations that year, just an announcement of winners.