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: SCIENCE GRAB BAG 
Clue: A material called URhGe can be manipulated into being this, lacking electrical resistance

SOLUTION: superconductors

PROBLEM: Category: ALL ABOARD AMTRAK 
Clue: The Keystone Route serves NYC, Philly & this capital; Three Mile Island's nearby if you're the nuclear plant gawker type

SOLUTION: harrisburg

PROBLEM: Category: THAT'S SHOE BIZ 
Clue: A fan of these German sandals with contoured insoles, Heidi Klum has even designed her own line

SOLUTION:
birkenstocks