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.

[EX Q]: Category: ONE-NAMED PERSONALITIES 
Clue: Known as "The Face of '66", this British supermodel has her own clothing line
[EX A]: twiggy

[EX Q]: Category: A CHRISTMAS POTPOURRI 
Clue: On Christmas Eve 1968, Borman, Lovell & Anders became the first men to circle this object
[EX A]: the moon

[EX Q]: Category: UP & ATOM 
Clue: In 1932 James Chadwick discovered these non-charged particles
[EX A]:
neutrons