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The modern era of lighter-than-air flight began early in the 17th century with Galileo 's experiments in which he showed that air has weight .
 person: Galileo
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Galileo