You are not the person you were fifteen years ago. The cells that compose your tissues and deliver oxygen have been recycled many times over. Your face has changed. You move differently. You’re probably slower and weaker, or, depending on your daily habits, faster and stronger. As it becomes available, you incorporate new information into your belief system. Even the neat narrative we imagine we’re orchestrating unbroken in our heads has nightly intermissions lasting hours during which we have no real clue what happens.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)