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.

Category: STAND BY YOUR MANNEQUIN 
Clue: In a magazine called The Show Window, this Oz creator dispensed advice on mannequins & creative display
l. frank baum

Category: THE ENVIRONMENT 
Clue: According to Guinness, this NW state has the largest living organism, a fungus covering 1,500 acres
washington

Category: MYTHELLANEOUS 
Clue: In Norse mythology, the Norns are 3 sisters who made one of these for every life

a thread