There's a big invention fair going on in Geneva.
Quick--pick the real invention:
--Microbe-killing underwear that only has to be washed once a year
--Artificial nose hair
--A guitar tuner that automatically senses when your guitar goes out of tune, then turns the pegs until it's back in tune, as you play it
When you have an answer, the story is here.
(Thanks to God Is My Codependent for one of the fake ones.)