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==5th century BC==
*430 BC - [[Empedocles]] proves that air is a material substance by submerging a [[water
==2nd century BC==
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*1914 - [[James Franck]] and [[Gustav Ludwig Hertz]] conduct the [[Franck–Hertz experiment]] demonstrating quantization of atomic ionization energy.
*1919 – [[Arthur Eddington]]: Our sun as [[gravitational lens]], a proof of the [[theory of relativity]].
*1920 – [[Otto Stern]] and [[Walter Gerlach]] conduct the [[Stern–Gerlach experiment]], which demonstrates particle [[Spin (
*1920 – [[John B. Watson]] and [[Rosalie Rayner]] conduct the [[Little Albert experiment]].
*1928 – [[Griffith's experiment]] shows that living cells can be transformed via a [[transforming principle]], later discovered to be [[DNA]].
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{{DEFAULTSORT:Timeline Of Scientific Experiments}}
[[Category:Science timelines|
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