19990709 Electromagnetic Spectrum Describes component parts and underlying mathematics of the EM spectrum. Also outlines practical applications such as radio communication, and involvement in medical diagnosis and treatment. 20000629 High Energy Astrophysics Science Archive Research Center Includes information on supernovas, X-ray binaries, black holes and the research programme. Structural data is cross-linked to bibliographic information, sequence databases, and to the NCBI taxonomy. The recent claim, made following x-ray observations, that these can be attributed to chance overlap, is discussed along with more traditional arguments.
Most information is available in English and German.
Includes case histories for diagnoses, and tutorials on a range of topics.