Answer:
Kids play it and Michelangelo sculpted with it.
Break it and it gets better, immediately set and harder to break again.
As strong as love, more dangerous than cancer.
It goes up and down the stairs without moving.
I'm a god, a planet, and measurer of heat. Who am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?