1920s in science

thumb|An outline map of the various hydroelectricity and land reclamation projects combined in Atlantropa

cosmological model involving repetitions of Big Bangs followed by Big Crunches

overview of natural science-related events during the year of 1920

overview of natural science-related events during the year of 1924

overview of natural science-related events during the year of 1926

overview of natural science-related events during the year of 1923

overview of natural science-related events during the year of 1929

overview of natural science-related events during the year of 1928

overview of natural science-related events during the year of 1925

overview of natural science-related events during the year of 1927

overview of natural science-related events during the year of 1922

overview of natural science-related events during the year of 1921

research expedition

bilateral Chinese-English expedition, led by Sven Hedin, which carried out scientific research in north and northwest China, 1927–1935

Teuthonista is a phonetic transcription system used predominantly for the transcription of (High) German dialects. It is very similar to other Central European transcription systems from the early 20th century. The base characters are mostly based on the Latin alphabet, which can be modified by various diacritics.