Answer:
I work when I play and play when I work.
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
I am believed to be only one dimensional, and tinier than anything can be, and there are many who say that I am the basis of all that we see. What am I?
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
What does man love more than life, fear more than death or mortal strife. What the poor have, the rich require, and what contented men desire. What the miser spends, and the spendthrift saves. And all men carry to their graves.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?