Answer:
What does everyone know how to open but not how to close?
What has four wings but cannot fly and uses the wind but does not know why?
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
Break it and it is better, immediately set and harder to break again.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?