Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
What building has the most stories?
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls
I am a type of weapon for SCI-FI characters
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
No matter how little or how much you use me, you change me every month.