Answer:
The more you take, the more you leave behind.
A reaction to being spooked that takes its name from waterfowl
A harvest sown and reaped on the same day in an unplowed field. Which increases without growing, remains whole though it is eaten within and without. Is useless and yet the staple of nations.
Thousands of these come together to make a digital image. What is it?
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?