Historical evidence allows and gives the human being a chance to look back at their mistakes and improve upon it.  The historical sources and evidence we, students have now help us to learn and study the events in history. As well as studying these sources it is important to evaluate them and prevent future disasters from occurring in the future. It is important to preserve the historical sources we have now, so that our future generation will not forget the disastrous events in history and will always think to prevent them.