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Nuclear Magnetic Resonance
Isidor Ra-bi discovered nuclear magnetic resonance, is a research technique that uses the magnetic properties of certain atomic nuclei.
Nuclear fission of heavy elements
Nuclear fission of heavy elements was discovered on December 17, 1938 by German Otto Hahn and his assistant Fritz Strassmann, and explained in theory on January 1939 by Lise Meitner and Otto Robert Frisch.

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FM Brodcasting
Edwin Armstrong " conducted the first large scale field tests of his FM radio technology on the 85th floor of RCA's (Radio Corporation of America)" Sadly RCA rejected the patent. On June 17th Armstrong presented at Federal Communications Commission (FCC) headquarters. He started by playing a jazz song on AM broadcasting then switched to FM broadcasting.

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Calorie Restriction Extends
Clive McKay extended calorie restriction to the maximum lifespan of rats . Proving that caloric restriction increases the life span of rats.
First Synthesis of Vitamin C.
Norman Hayworth and Edmund Hurst reported the first synthesis of Vitamin C in 1934, when Hayworth collaborated with the British chemist Edmund Hurst, and they succeeded in synthesizing the Vitamin C.

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Discovery of the Neutron
James Chadwick was assigned the task of tracking down evidence of the neutron. The neutron was discovered in May of 1932.
First Astronomical Radio Source,
Karl Goethe Jan-sky discovers the first astronomical radio source. Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by alien sources.

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Tilt Rotor
A tilt rotor is an aircraft which uses a pair or more of powered rotors. In September 1930, George Lederberg devised the basic concept of tilt rotor aircraft.
Eponymous limit
Subrahmanyan Chandrasekhar discovers his eponymous limit of the maximum mass of a white dwarf star.

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Hubble's Law

Edwin Hubble publishes his astronomical discovery , which becomes known as Hubble's law.

Cyclotron
A cyclotron is a type of particle accelerator that accelerate charged particles using a high-frequency, alternating voltage. The cyclotron was invented in 1929 by Ernest O. Lawrence at the University of California at Berkeley.
The First Cyclotron