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Where do you end and the 'outside world' begin?

Asked by stump (3855points) February 3rd, 2010

When does air stop being just air and become your breath? Is it when it enters your nose or mouth, when it enters your lungs, or when it passes through the cell wall?
When does food stop being food and become you? When do our wastes stop being us.
What about ideas? Is your unspoken idea part of your mind? If so, when you speak it is it no longer part of you? When we share ideas, does it mean we share part of our mind?
What about actions? Are the things we do part of us?

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