Answer:
What goes up but never comes down?
I know a word of letters three. Add two, and fewer there will be!
Describes a mysterious region and a stylish pair of shorts.
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?