Answer:
How can a pants pocket be empty and still have something in it?
They can be long or short; they can be grown or bought; they can be painted or left bare; they can be round or square.
I have eighty-eight keys but cannot open a single door? What am I?
I'm a god, a planet, and measurer of heat. Who am I?
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.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.