Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

What was J.F.K. airport originally called?
idlewild

Derived from the Greek word meaning perimeter, what is the text form of the sixteenth letter of the Greek alphabet?
pi

'Hello darkness my old friend' are the first words of which Simon and Garfunkel song?

the sound of silence