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The whole concept of identity always made the man curious. All science branches dealt with the importance of identity and what defines it. In particular, many philosophers spoke of the "identity" it self and more specifically of the personal identity. Some philosophers believed that what identifies each person is the outer appearance and that from the moment your are born in this body and you die in the same body, this is your identity. However some other philosophers have stated that, what matters is not the outside appearance of any man but its own memories. For example, if you place a persons mind into another body while keeping the same memories, that does not change his identity, even though his outside appearance is different. John Lock once said that if you remember the first thing you did in a very young age this means that you are the same person and that identity is just a chain of memories.