Answer:
What can you hold in your left hand but not in your right hand?
Used to keep prisoners silent and to make temporary repairs on cars.
I start in little but I end in full, you'll find me in half and complete.
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
You can have it, and be at it, But it never lasts forever.
I saw the dead bring forth the living. I saw the living bring forth the dead. What did I see?