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Questions regarding why the universe behaves in such a way have been described by physicists and cosmologists as being extra-scientific ( i.e. , metaphysical ) , though speculations are made from a variety of perspectives that include extrapolation of scientific theories to untested regimes ( i.e. , at Planck scales ) , and philosophical or religious ideas .
 person: Planck
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: Planck