Answer:
Split me in half, and you get me and another me. What word am I?
Once you know it exists, it no longer exists. What is it?
What can you hold in your left hand but can never hold in your right hand?
What body part is pronounced as one letter but written with three, only two different letters are used?
What do you have in December that you don't have in any other month?
People take me on walks and I run and have fun. What am I?