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Photon - Wikipedia
![Photon - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/1926_Gilbert_N._Lewis_letter_which_brought_the_word_"photon"_into_common_usage.jpg/990px-1926_Gilbert_N._Lewis_letter_which_brought_the_word_"photon"_into_common_usage.jpg)