Answer:
Slayer of regrets, old and new, sought by many, found by few.
The sun bakes them, the hand breaks them, the foot treads on them, and the mouth tastes them.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
Above all things have I been placed Thus have I, a man disgraced. I describe sunlight or lock But after all, I'm just a rock
Break me and I am better immediately set and harder to be broken again.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?