Answer:
What can be measured but not seen?
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
I am a fire's best friend. When fat, my body fills with wind. When pushed to thin, through my nose I blow. Then you can watch the embers glow.
What does no man want, yet no man want to lose?
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen.
What language does a billboard speak?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?