1921 in science
Encyclopedia
The year 1921 in science
and technology
involved some significant events, listed below.
Science
Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe...
and technology
Technology
Technology is the making, usage, and knowledge of tools, machines, techniques, crafts, systems or methods of organization in order to solve a problem or perform a specific function. It can also refer to the collection of such tools, machinery, and procedures. The word technology comes ;...
involved some significant events, listed below.
Chemistry
- Thomas MidgleyThomas Midgley, Jr.Thomas Midgley, Jr. was an American mechanical engineer and chemist. Midgley was a key figure in a team of chemists, led by Charles F. Kettering, that developed the tetraethyllead additive to gasoline as well as some of the first chlorofluorocarbons . Over the course of his career, Midgley was...
discovers the effective anti-knocking properties of Tetra-ethyl leadTetra-ethyl leadTetraethyllead , abbreviated TEL, is an organolead compound with the formula 4Pb. An inexpensive additive, its addition to gasoline from the 1920's allowed octane ratings and thus engine compression to be boosted significantly, increasing power and fuel economy...
, which is used in "leaded" gasolineGasolineGasoline , or petrol , is a toxic, translucent, petroleum-derived liquid that is primarily used as a fuel in internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. Some gasolines also contain...
(petrol).
Mathematics
- John Maynard KeynesJohn Maynard KeynesJohn Maynard Keynes, Baron Keynes of Tilton, CB FBA , was a British economist whose ideas have profoundly affected the theory and practice of modern macroeconomics, as well as the economic policies of governments...
publishes A Treatise on ProbabilityA Treatise on ProbabilityA Treatise on Probability was published by John Maynard Keynes while at Cambridge University in 1921. The Treatise attacked the classical theory of probability and proposed a "logical-relationist" theory instead...
. - Emmy NoetherEmmy NoetherAmalie Emmy Noether was an influential German mathematician known for her groundbreaking contributions to abstract algebra and theoretical physics. Described by David Hilbert, Albert Einstein and others as the most important woman in the history of mathematics, she revolutionized the theories of...
publishes Idealtheorie in Ringbereichen, developing ideal ring theoryIdeal (ring theory)In ring theory, a branch of abstract algebra, an ideal is a special subset of a ring. The ideal concept allows the generalization in an appropriate way of some important properties of integers like "even number" or "multiple of 3"....
, an important text in the field of abstract algebraAbstract algebraAbstract algebra is the subject area of mathematics that studies algebraic structures, such as groups, rings, fields, modules, vector spaces, and algebras...
. - First publication of Ludwig WittgensteinLudwig WittgensteinLudwig Josef Johann Wittgenstein was an Austrian philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. He was professor in philosophy at the University of Cambridge from 1939 until 1947...
's Tractatus Logico-PhilosophicusTractatus Logico-PhilosophicusThe Tractatus Logico-Philosophicus is the only book-length philosophical work published by the Austrian philosopher Ludwig Wittgenstein in his lifetime. It was an ambitious project: to identify the relationship between language and reality and to define the limits of science...
, as "Logisch-Philosophische Abhandlung" in Annalen der Naturphilosophie.
Medicine
- July 18 - The first BCGBacillus Calmette-GuérinBacillus Calmette-Guérin is a vaccine against tuberculosis that is prepared from a strain of the attenuated live bovine tuberculosis bacillus, Mycobacterium bovis, that has lost its virulence in humans by being specially subcultured in an artificial medium for 13 years, and also prepared from...
vaccination against tuberculosisTuberculosisTuberculosis, MTB, or TB is a common, and in many cases lethal, infectious disease caused by various strains of mycobacteria, usually Mycobacterium tuberculosis. Tuberculosis usually attacks the lungs but can also affect other parts of the body...
. - July 27 - Researchers at the University of TorontoUniversity of TorontoThe University of Toronto is a public research university in Toronto, Ontario, Canada, situated on the grounds that surround Queen's Park. It was founded by royal charter in 1827 as King's College, the first institution of higher learning in Upper Canada...
led by biochemistBiochemistryBiochemistry, sometimes called biological chemistry, is the study of chemical processes in living organisms, including, but not limited to, living matter. Biochemistry governs all living organisms and living processes...
Frederick BantingFrederick BantingSir Frederick Grant Banting, KBE, MC, FRS, FRSC was a Canadian medical scientist, doctor and Nobel laureate noted as one of the main discoverers of insulin....
announce the discovery of the hormoneHormoneA hormone is a chemical released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism. Only a small amount of hormone is required to alter cell metabolism. In essence, it is a chemical messenger that transports a signal from one...
insulinInsulinInsulin is a hormone central to regulating carbohydrate and fat metabolism in the body. Insulin causes cells in the liver, muscle, and fat tissue to take up glucose from the blood, storing it as glycogen in the liver and muscle....
.
Physics
- T. Kaluza demonstrates that a five-dimensional version of Albert EinsteinAlbert EinsteinAlbert Einstein was a German-born theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics and one of the most prolific intellects in human history...
's equations unifies gravitationGravitationGravitation, or gravity, is a natural phenomenon by which physical bodies attract with a force proportional to their mass. Gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped...
and electromagnetismElectromagnetismElectromagnetism is one of the four fundamental interactions in nature. The other three are the strong interaction, the weak interaction and gravitation...
.
Psychology
- Hermann RorschachHermann RorschachHermann Rorschach was a Swiss Freudian psychiatrist and psychoanalyst, best known for developing a projective test known as the Rorschach inkblot test. This test was reportedly designed to reflect unconscious parts of the personality that "project" onto the stimuli...
publishes PsychodiagnostikPsychodiagnostikPsychodiagnostik is a 174-page monograph written by Hermann Rorschach in 1921 containing the results of his studies on mental patients, and 10 cards that became the foundation of the Rorschach test....
, proposing the inkblot testRorschach testThe Rorschach test is a psychological test in which subjects' perceptions of inkblots are recorded and then analyzed using psychological interpretation, complex algorithms, or both. Some psychologists use this test to examine a person's personality characteristics and emotional functioning...
. - Gaëtan Gatian de ClérambaultGaëtan Gatian de ClerambaultGaëtan Henri Alfred Edouard Léon Marie Gatian de Clérambault was a French psychiatrist.De Clérambault gained his thesis in 1899. In 1905 he became assistant physician at the special infirmary for the insane, Prefecture de Police. From 1920 he was head of this institution...
publishes Les Psychoses passionelles, a comprehensive review of erotomaniaErotomaniaErotomania is a type of delusion in which the affected person believes that another person, usually a stranger or famous person, is in love with him or her. The illness often occurs during psychosis, especially in patients with schizophrenia or bipolar mania...
.
Awards
- Nobel PrizeNobel PrizeThe Nobel Prizes are annual international awards bestowed by Scandinavian committees in recognition of cultural and scientific advances. The will of the Swedish chemist Alfred Nobel, the inventor of dynamite, established the prizes in 1895...
- PhysicsNobel Prize in PhysicsThe Nobel Prize in Physics is awarded once a year by the Royal Swedish Academy of Sciences. It is one of the five Nobel Prizes established by the will of Alfred Nobel in 1895 and awarded since 1901; the others are the Nobel Prize in Chemistry, Nobel Prize in Literature, Nobel Peace Prize, and...
- Albert EinsteinAlbert EinsteinAlbert Einstein was a German-born theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics and one of the most prolific intellects in human history... - ChemistryNobel Prize in ChemistryThe Nobel Prize in Chemistry is awarded annually by the Royal Swedish Academy of Sciences to scientists in the various fields of chemistry. It is one of the five Nobel Prizes established by the will of Alfred Nobel in 1895, awarded for outstanding contributions in chemistry, physics, literature,...
- Frederick SoddyFrederick SoddyFrederick Soddy was an English radiochemist who explained, with Ernest Rutherford, that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions. He also proved the existence of isotopes of certain radioactive elements... - Physiology or MedicineNobel Prize in Physiology or MedicineThe Nobel Prize in Physiology or Medicine administered by the Nobel Foundation, is awarded once a year for outstanding discoveries in the field of life science and medicine. It is one of five Nobel Prizes established in 1895 by Swedish chemist Alfred Nobel, the inventor of dynamite, in his will...
- not awarded
- Physics
Deaths
- March 29 - John BurroughsJohn BurroughsJohn Burroughs was an American naturalist and essayist important in the evolution of the U.S. conservation movement. According to biographers at the American Memory project at the Library of Congress,...
(b. 18371837 in scienceThe year 1837 in science and technology involved some significant events, listed below.-Astronomy:* August 9 - Edward C. Herrick, in New Haven, Connecticut, identifies the Perseids as an annual phenomenon....
), naturalistNatural historyNatural history is the scientific research of plants or animals, leaning more towards observational rather than experimental methods of study, and encompasses more research published in magazines than in academic journals. Grouped among the natural sciences, natural history is the systematic study...
. - October 23 - John Boyd DunlopJohn Boyd DunlopJohn Boyd Dunlop was a Scottish inventor. He was one of the founders of the rubber company that bore his name, Dunlop Pneumatic Tyre Company....
(b. 18401840 in scienceThe year 1840 in science and technology involved some significant events, listed below.-Events:* William Whewell publishes the term scientist....
), inventor.