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Really simplistic answer, but should get you started: there is no single definable thing that is identifiably "you". If you lost a foot, would you still be you? At what point does the food you eat become a part of you? If you lost your memories, or changed your mind about something you believe deeply, or if you go to sleep, do you stop being you?

Another angle:

How many of the tags you use to idendify yourself are actually group membership tags... e.g. pythonista, founder, etc.?

How many of the activities you do only make sense in the context of people (productive member of society stuff)? Even more, how many of the things you do are because of the consequences for or from others (feed your family, help your friends, do something recognized as really cool)?

Where "me" stops and society begins is always a bit fuzzy.

"Trying to define yourself is like trying to bite your own teeth." - Alan W. Watts

How do I know who I am? When I try a new food, what are my criteria for deciding whether or not I like it? If I wish to be a better person, why am I not already that better person?

:) Enjoy!

http://lesswrong.com/lw/r9/quantum_mechanics_and_personal_id...