Answer:
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
What can go through glass without breaking it?
What must be in the oven yet can not be baked? Grows in the heat yet shuns the light of day? What sinks in water but rises with air? Looks like skin but is fine as hair?
With head without hair. With mouth without tooth.
What age most travelers have?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?