Answer:
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
I am never quite what I appear to be. Straight-forward I seem, but it's only skin deep. For mystery most often lies beneath my simple speech. Sharpen your wits, open your eyes, look beyond my exteriors, read me backwards, forwards, upside down. Think and answer the question...
What is that you will break everytime you name it?
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
Without this, eating food and Steven Spielberg's career would be very different.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?