FIRST Jeopardy 3.0! (6/20)
 

Planning, attending, and recovering from Battlecry left me unable to do this for the past few days. Scores for the first half of the month are tallied. Back to the regular schedule:

For 400, this is the ability to hear things not audible within normal hearing ranges. Remember to PM me your answer in the form of a question within 50 minutes.