TASK DEFINITION: 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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: WEIGHTS & MEASURES
Clue: To the Ancient Greeks, 4 of these made a palm

SOLUTION: fingers

PROBLEM: Category: ASTROLOGY TIME
Clue: Considered the first sign of the zodiac, it's often represented by a ram

SOLUTION: aries

PROBLEM: Category: THE MISSIVES OF OCTOBER
Clue: Oct. 24, 1648: Dear Johann, I can't believe this long war is over now that the Peace of Westphalia has been concluded

SOLUTION:
the thirty years' war