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1930 | Pluto

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
Publication:Science News
Geographic Code:1USA
Date:Mar 24, 2012
Previous Article:Rise of quantum theory.
Next Article:Germ warfare.

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