Answer:
Sometimes you feel it weigh a ton. Yet it is nothing, but somehow still there. Makes you uncomfortable around anyone, But speak its name and it's gone.
The thinkers usually hold this body part
Take it and you will lose or gain more than all the others.
What goes up and down the stairs without moving?
What ship has no captain but two mates?
I am a room that has a roof but no walls. What am I?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?