Just a few centuries ago we knew more about an important person because of the letters they wrote with their own hand with their parents, friends and others. Now that we use the e-mail and other messages that we don't have access, how do we are going to know about how a person was? For example, Leonardo da Vinci would be upset if he knew that we read his letters and that we have an idea of his mother relationship, but if Leonardo would use e-mail, how do we know how he felt?