Please compile a list of the most important scientific discoveries of the 20th century.
user
Sure, that’s not a tough one!  Here’s the top of my list:

Max Planck: quantum theory and the existence of matter & energy as discrete quanta

Albert Einstein: special theory of relativity, including his theories on gravitation, general relativity

Enrico Fermi: nuclear fission

Howard Florey: first use of penicillin

Luis Walter Alvarez: discovery of the electromagnetic properties of neutrons

Francis Crick: co-discoverer of the double helix structure of DNA

Wilhelm Conrad Roentgen: discoverer of X-rays

James Chadwick: discoverer of the neutron

John Bardeen: co-inventor of the transistor

Edward Teller: co-inventor of the hydrogen bomb

Alexander Fleming: discoverer of penicillin

Dorothy Crowfoot Hodgkin: discoverer of the structure of benzene

J. Robert Oppenheimer: father of the atomic bomb

Konrad Zacharias: discoverer of the first German reactor

Karl Ziegler: co-inventor of the first synthetic rubber

J.H. Van't Hoff: developer of the van't Hoff equation

Robert Millikan: developed the oil drop experiment for the electron, developed the relationship between the mass of the electron and the charge of the electron

Cecil Frank Powell: discoverer of the neutron

Alfred H. Sturtevant: father of genetic engineering

Gertrude Elion: co-developer of the drug amoxicillin

Ernest Orlando Lawrence: co-developer of the cyclotron

John Bardeen: co-inventor of the transistor

Leo Szilard: co-inventor of the neutron chain reaction

Edward Teller: father of the H-bomb

William H. Draper: developer of a multitude of vacuum tubes, the first electron microscope

Arthur Holly Compton: discovered the photoelectric effect

J.J. Thompson: discoverer of the electron

Howard Roberts: discoverer of the electron

Linus Pauling: discovery of the structure of DNA

C.G. Darwin: father of radiometric dating

Paul Dirac: co-discoverer of the electron spin

Marie Curie: co-discoverer of radioactivity

John Logie Baird: development of the television

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assistant
Please compile a list of the most important scientific discoveries of the 20th century.
user
I’d say the most important scientific discoveries in the 20th century include the discoveries that led to DNA technology, X-ray astronomy, the theory of relativity, and several other major breakthroughs in fundamental physics, chemistry, and biology.
assistant
Please compile a list of the most important scientific discoveries of the 20th century.