Answer:
Useful term for when you need to start a fire or notice someone with the same shirt as you.
It's what light turns into in the night
What instrument can you hear but never see?
The more you look at it, The less you see.
Though I should be unique, you've made most of us the same. I would be stronger, if my characters were stranger.
How did the farmer find his wife?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?