This website does justice to its title. There is a wealth of information available related to almost every branch of science, whether it be astronomy, physics, biology or mathematics. The information is presented in an encyclopaedic format. There is also a searchable database of books related to science.
SETI@Home is basically a scientific experiment in which you can participate on a personal level. This is an experiment in receiving and analysing radio telescope data to search for “extraterrestrial intelligence.” All you need is a simple program which you can download from the website.
If you fancy yourself as a geek, then here is a site for you. The official website of a scientific magazine, it also delves into the latest news related to science and technology, features, in-depth analyses and, of course, lots of links. Visiting this website regularly will definitely keep you updated on the scientific front.
Whether you are a student studying about volcanoes or a teacher who wants to make it interesting for the students, this website will definitely help you out. It features lots of fact sheets, profiles of active volcanoes and information on how volcanic activity is monitored. Stories of when and where different volcanoes erupted are also available.