Answer:
Man's most important invention.
Spies and detectives do this to phones and musical shoes make this sound.
Tall, I am young. Old, I am short. With life I glow. Anemoi is my foe.
How many months of the year have 28 days?
What goes up and down without moving?
If a rooster lays an egg on the exact peak of a barn, which side does it fall?