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| 1900 |
| | | The Bayer company in Germany sells aspirin in the form of water-soluble tablets, the first medication of its kind | |
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| 1900 |
| | | Sigmund Freud publishes one of his most significant works, The Interpretation of Dreams | |
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| 1900 |
| | | German physicist Max Planck proposes the revolutionary concept of the quantum theory | |
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| 1900 |
| | | The Russian physiologist Ivan Pavlov keeps dogs alive almost indefinitely by severely curtailing their bodily functions | |
|  | Five experimental dogs in Pavlov's laboratory
Wellcome Library, London
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| 1901 |
| | | Photographer Eadweard Muybridge extends the range of his studies with Human Figure in Motion | |
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| c. 1901 |
| | | A stele is found at Susa, in Iran, giving the text of the Code of Hammurabi | |
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| 1902 |
| | | A.E. Kennelly and Oliver Heaviside independently see the link between the atmosphere and the behaviour of radio waves | |
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| 1903 |
| | | German surgeon Georg Clemens Perthes discovers, in Leipzig, that X-rays can inhibit cancer | |
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| 1903 |
| | | In a paper to a congress in Madrid, on the 'psychology and psychopathology of animals', Ivan Pavlov announces his discovery of the conditioned reflex | |
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| 1903 |
| | | Ernest Rutherford and Frederick Soddy identify the phenomenon of radioactive half-life | |
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