Answer:
There are millions of me. I am very small but when moving fast I am deadly.
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.
Steals an event or even a mood. Reveals the truth or shatters it.
We are five little objects of an everyday sort. You will find us all in a tennis court.
It's anything but amusing when this body part gets hit.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.