Answer:
Who is it that rows quickly with four oars, but never comes out from under his own roof?
What moves without seeing and cries without eyes?
What has three feet but no arms or legs?
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
What language does a billboard speak?