January 3, 1909 (Sunday)
- The Deutsche Gesellschaft für Soziologie (DGS, German Society for Sociology) was founded in Berlin by Max Weber, Rudolf Goldscheid, Ferdinand Tönnies, Georg Simmel, and others.
- In Italy, the volcano on Stromboli Island erupted. The volcano gave its name to the strombolian eruption, in which small amounts of lava are fired high into the air.
- Born: Victor Borge, Danish entertainer, as Børge Rosenbaum in Copenhagen (d. 2000)
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