From site: Serendip sees the web as a tool which can make education a more interactive and exploratory process, by making freely available educational resources at a variety of levels and also, even more importantly, be making it increasingly possible to learn by doing (see Serendip’s web principles and credo on education and technology). To encourage understanding and use of the web in this way, Serendip provides annotated lists of links useful for learning/teaching in a variety of areas (see Interactive Physics and Interactive Biology). The focus is not on course syllabi or notes but rather on materials from which individuals can learn themselves, and particularly on those with an interactive component.