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" Metric Time and Non-Metric Time : The Speed of Light . " An {{USERNAME}} essay . Forgot to put the URL . Here it is : {{URL}} The full essay .
 The Speed of Light
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 The Speed of Light