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| 1925 |
| | | 23-year-old German physicist Werner Heisenberg publishes his ground-breaking theory of quantum mechanics | |
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| 1925 |
| | | Austrian physicist Wolfgang Pauli formulates his exclusion principle, stating that no two electrons in an atom can have the same four quantum numbers | |
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| 1925 |
| | | Biology teacher John Scopes is prosecuted for breaking state law by teaching evolution to his class of children in Dayton, Tennessee | |
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| 1926 |
| | | To explain the irregular movement of stars, Swedish astronomer Bertil Lindblad proposes the theory that our galaxy rotates | |
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| 1926 |
| | | British astrophysicist Arthur Eddington compares mass and luminosity in The Internal Constitution of the Stars | |
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| c. 1927 |
| | | British archaeologist Leonard Woolley discovers the treasures of the royal cemetery at Ur | |
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| 1927 |
| | | Werner Heisenberg publishes his Uncertainty Principle, declaring that it is impossible to define precisely the position and momentum of a sub-atomic particle | |
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| c. 1927 |
| | | The fossilized tooth of a human, half a million years old and known now as Peking Man, is discovered at a site near Beijing | |
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| 1927 |
| | | Austrian zoologist Karl von Frisch demonstrates that bees communicate the whereabouts of food by means of a dance | |
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| 1928 |
| | | English psychologist Henry Havelock Ellis completes a thirty-year project, his 7-volume Studies in the Psychology of Sex | |
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