The human mind is a complete mystery. To everyone. Scientists and doctors may try to understand it but I think they will never ever do it. If you think about it, you'll see that the answer for that enigma is the same as trying to know what is life. How did it all begin? We are made from pieces of other people. This is just like "Who was born first: the chicken or the egg?". Sometimes people act so unpredictably. What make us do that? Where does our personality comes from? It's not from our parents, nor from our professors, nor our brothers and sisters, nor our friends... What makes us us?