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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 |
| | | Ferdinand Zeppelin's first dirigible makes its test flight from a floating hangar on the Lake of Constance | |
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| 1900 |
| | | The British government assumes direct responsibility for the entire region of Nigeria, previously entrusted to a commercial company | |
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| 1900 |
| | | German physicist Max Planck proposes the revolutionary concept of the quantum theory | |
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| 1901 |
| | | Daimler cars launch a new brand, the Mercedes 35 hp, named after the ten-year-old daughter of the investor and distributor Emil Jellinek | |
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| 1901 |
| | | Thomas Mann's first novel, Buddenbrooks, brings him immediate success | |
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| 1903 |
| | | German surgeon Georg Clemens Perthes discovers, in Leipzig, that X-rays can inhibit cancer | |
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| 1905 |
| | | Albert Einstein explains the photoelectric effect as a flow of discreet particles (quanta) of electromagnetic radiation | |
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| 1905 |
| | | Kaiser Wilhelm II visits Tangier in support of Moroccan independence, causing a diplomatic crisis with the colonial powers France and Britain | |
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| 1905 |
| | | German biologists Fritz Schaudinn and Erich Hoffmann discover the micro-organism Treponema pallidum which causes syphilis | |
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