Answer:
Without this, eating food and Steven Spielberg's career would be very different.
It's usually found dried, but often kept slicker. Above another need, it's said to be thicker. What is it?
This is needed both for courage and hardcover books.
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?