Answer this correctly.

1. The more you take away from me, The bigger I get.

    What am I?

2. It belongs to you But others use it more than you do
    What is it?

3. I sit in a corner And travel around the world.
    What am I?

4. I have four identical brothers I don’t get out as much as them
While the four of them go around I sleep quietly, in the dark I am often forgotten about
But in times of trouble I will be woken and called upon And I will save the day

Lets see who will answer this correctly.