Clyde Tombaugh discovers Pluto, a new planet predicted 25 years earlier by Percival Lowell (3/22/30, p. 178, 179, 180, 181, 186, 190; 3/29/30, p.197).
1930 | Vitamin C
Albert Szent-Gyorgyi reports isolating hexuronic acid, later identified as vitamin C (9/20/30, p. 184; 5/7/32,19. 292). N
1931 | Deuterium
Heavy hydrogen atoms, now known as deuterium, are discovered by Harold Urey and George M. Murphy (12/19/31, p. 387). N
1931 | Mayan translator
Mayan glyphs are deciphered for the first time (9/3/31, p. 147).
1932 | Neutron
James Chadwick discovers the neutron, an uncharged particle in the atomic nucleus (3/5/32, p.143). N
1932 | Positron
Carl Anderson reports discovering a positively charged subatomic particle, later dubbed the positron--the first example of antimatter (9/24/32, p. 197). N
1933 | Radio astronomy
Karl Jansky's discovery of a shortwave radio hiss coming from the Milky Way's heart is widely publicized, marking the beginning of radio astronomy (6/3/33, p. 339).
1933 | Defibrillation
A strong electrical shock is found to restore a heartbeat to surgical patients whose hearts have begun fibrillating or have stopped (5/20/33, p. 317).
1934 | Radioactivity
Irene Joliot-Curie and husband Frederic Joliot create the first "artificial radioactivity" by bombarding boron with alpha particles (2/10/34, p. 83; 3/3/34, p.133). N
1934 | Acetylcholine
Henry Dale reports the discovery of acetylcholine, a chemical released by nerves to command a muscle to move (10/27/34, p. 266). N
1935 | Alpha, beta brain
Scientists use electroencephalographs to show that two types of electrical waves, labeled alpha and beta, occur in the brain (1/19/35, p. 35).
1936 | Antibiotics
Major new antibiotics, later known as sulfanilamides, are developed in Germany and show promise in U.S. tests against Streptococcus infections (11/28/36, p. 339). N
1937 | Muon
A new subatomic particle somewhere between an electron and a proton in mass, later termed the muon, is reported from debris of cosmic ray bombardments (5/8/37, p. 291; 5/29/37, p. 349; 11/27/37, p. 339).
1938 | Synthetic silk
E.I. du Pont de Nemours & Co. is preparing to market nylon, a synthetic "silk" fiber, invented by late chemist Wallace Hume Carothers (10/1/38, p. 211).
1938 | Nuclear stars
Nuclear physicist Hans Bethe describes how hydrogen atoms inside stars combine to form helium, releasing vast amounts of energy in the process (12/31/38, p. 425). N
1939 | Splitting uranium
Scientists from Germany report the release of energy from splitting uranium atoms (2/11/39, p. 86). N
1939 | Fluorine
Epidemiological data show that adding fluorine to drinking water cuts the risk of cavities (6/10/39, p. 365).
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|Title Annotation:||90TH ANNIVERSARY ISSUE: 1922-1935; scientific and technological breakthroughs|
|Date:||Mar 24, 2012|
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