Answer:
What is often returned but is never borrowed?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find
What is never used unless it's in a tight place?
Without this, eating food and Steven Spielberg's career would be very different.
I can be cracked, I can be made. I can be told, I can be played.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?