Answer:
Take it and you will lose or gain more than all the others.
Split me in half, and you get me and another me. What word am I?
White and thin, red within, with a nail at the end. What is it?
I have eighty-eight keys but cannot open a single door? What am I?
What can be white and yellow at the same time?
People take me on walks and I run and have fun. What am I?