Answer:
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
I am so simple that I can only point. Yet I guide men all over the world.
What flies without wings?
Salty water everywhere but not sea in sight.
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
I start with T end with T and within me is T.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?