We start by showing how science is as much a personal as a social endeavour, carefully driven between convictions and scepticism, depending on strictly defined criteria that are made possible through a conjunction of social norms intimately connected to epistemological principles. If the sociological contexts play an important role, we must recognize that science compensates their influence with the experimental gathering of evidences. However knowledge always requires a link to tradition, believe and authority, i.e., tacit knowledge and a fiduciary framework. Objectivity can also be supported by science’s success to describe and transform reality, within a renewed process that continuously expands what we know and can transform. Thi...