Would you still be human if you had a pig's heart?

 

Are you still you if you have someone else’s heart?

 

What if you could keep changing your old, worn-out organs for new ones? At what point would you stop being you?

 

If some of your cells are replaced every day, over time most of your cells will not be the ones you had at birth. Even the unchanged cells may have new materials within them. So...

Why do we say you are the same person you were when you were born?