You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: MATH & SCIENCE 
Clue: Around 1850 George Boole devised a new take on this branch of math

Answer: algebra


Question: Category: A CHRISTMAS POTPOURRI 
Clue: On Christmas Eve 1968, Borman, Lovell & Anders became the first men to circle this object

Answer: the moon


Question: Category: PLAYS 
Clue: The "American Buffalo" in David Mamet's play is one of these that would interest a numismatist

Answer:
nickel