Aristotle said that man is a social animal. When we live, we are constantly in contact with data coming from all sides. Whether it's a newspaper read on the train that brings us to our work, or information heard on leaving the station, or a text quickly glimpsed on the wall not far from the station where we come down: we are invaded by information - and some are more important than others. Unfortunately, we retain less than 1% of important information during our lifetime. Sometimes we try to note it here and there, and despite our great sense of organization, we often end up losing it.