Answer:
One more than a duet.
This type of corn swells up and bursts into a crisp puff when heated.
What is broken if you say its name?
Tall, I am young. Old, I am short. With life I glow. Anemoi is my foe.
Break it and it gets better, immediately set and harder to break again.
What never gets any wetter no matter how hard it rains?