Answer:
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.
What can bring back the dead. Make us cry, make us laugh, make us young. Born in an instant yet lasts a life time?
The itsy bitsy teeny weeny yellow polka dot variety is quite popular.
You can spin, wheel and twist. But this thing can turn without moving.
What get wet while drying
You use it between your head and your toes, the more it works the thinner it grows.