Answer:
What has 13 hearts but none beat?
When it is alive we sing, when it is dead we clap our hands. What is it?
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
What starts with a 'T', ends with a 'T', and has T in it?
If you have it, you want to share it. If you share it, you don't have it.
You use it between your head and your toes, the more it works the thinner it grows.