Medicine

• First successful insulin treatment of diabetes.

Physics

• Arthur Compton studies X-ray photon scattering by electrons
• Otto Stern and Walter Gerlach show "space quantization"

Technology

• The British Broadcasting Corporation (BBC) begins radio service in the United Kingdom.

Nobel Prizes

• Niels Bohr is awarded the Nobel Prize for Physics
• Francis William Aston is awarded the Nobel Prize for Chemistry
• Archibald Vivian Hill and Otto Fritz Meyerhof are awarded the Nobel Prize for Medicine

Births

• July 18 - Thomas Kuhn (d. 1996), philosopher of science
• November 8 - Christiaan Barnard (d. 2001), surgeon.

Deaths

• January 5 - Ernest Shackleton (b. 1874), explorer.
• January 22 - Camille Jordan (b. 1838), mathematician.
• May 26 - Ernest Solvay, (b. 1838) chemist.
• June 18 - Jacobus Kapteyn (b. 1851), astronomer.
• August 2 - Alexander Graham Bell (b. 1847), inventor.