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Some people mentioned some ideas in this forum about biological evolution being only progressive and not being able to move backwards.  Professor Grobstein did a drawing on the poster board, showing someone physically moving from one location to the next, and not being able to go back in time.  I guess the idea makes sense, but I am not convinced that we are always going forward and that we can never go back. Or, that we are constantly changing in ways that are not irreversable.  I guess people do change a lot and over time, due to many different factors, such as life, friends, influences, trajedies, love, etc....but I wonder if we can never go back?  If we think of things in this way, would that mean that there is no aspect of our personalitiy that remains constant? I just can't believe that there is no constancy.  Also, if people really believe that we can't go back and change something, then why has hypnosis been available to help people foget some tragedies that have occurred throughout their lifetimes or to stop doing certain things, such as smoking or over-eating.  Also, what about generative diseases, such as Alzheimer's?  Don't they prevent us from moving forward because they make us forget virtually everything from our past?