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The year 1920 in science and technology involved some significant events, listed below.

Contents 1 Biology 2 Medicine 3 Meteorology 4 Physics 5 Technology

[edit] Biology

• Andrew Douglass proposes dendrochronology dating.

[edit] Medicine

• Frederick Banting and Charles Best co-discover insulin.

[edit] Meteorology

• Milutin Milankovic proposes that long term climatic cycles may be due to changes in the eccentricity of the Earth's orbit and changes in the Earth's obliquity.

[edit] Physics

• Megh Nad Saha states his ionization equation
• Albert Einstein delivers his Leiden Lecture
• Ernest Rutherford predicts the existence of the neutron.
• Arthur Eddington's observation of a total eclipse of the Sun seems to confirm the "bending of light" in Einstein's theory of Special Relativity.
• James Jeans discovers that the dynamical constants of motion determine the distribution function for a system of particles.

[edit] Technology

• The first transatlantic two-way radio broadcast is made.
• First domestic radio sets come to stores in USA – Westinghouse radio costs $10