4986
He rediscovered George Hadley 's theory of atmospheric circulation ( now known as the Hadley cell ) around this time .
 person: George Hadley; person: Hadley
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: George Hadley; person: Hadley