Answer:
It's in your hand though you can not feel it. Only you and time can reveal it.
What kind of tree can you carry in your hand?
You may enter, but you may not come in. I have space, but no room, I have keys, but open no lock. What am I?
What is black and white and red all over?
What insect does a blacksmith manufacture?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.