Answer:
Hard to catch, easy to hold. Can't be seen, unless it's cold
What word looks the same upside down and backwards?
They can float and tickle, but their sound is rarely heard unless you're a pillow or bird. What are they?
What can go through glass without breaking it?
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
I have two bodies joined together as one. When standing still I run and run.