October 19, 1900 (Friday)
- Max Planck presented, to the Physical Society of Berlin, what is now called Planck's law of blackbody radiation, described as "a discovery that opened the way to the development of the quantum theory and provided the initial formulation for that theory".
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Famous quotes containing the word october:
“The autumnal change of our woods has not yet made a deep impression on our own literature yet. October has hardly tinged our poetry.”
—Henry David Thoreau (1817–1862)