Science is the systematic knowledge gained by use of reason based on observation.
Each field of science studies the nature of a certain kind of entity
Scientific knowledge is induced from observations, finding the single causal principle that explains a wide range of observed facts, integrated into all other knowledge without contradiction. (The crucial role of experimentation is to isolate possible causes.) Because scientific knowledge is the integration of observations into contextual principles, it must be understood historically, to know what it is that men observed and why certain principles are necessitated and justified by these observations.
- Astronomy Picture of the Day – NASA's collection of astronomical pictures
- ClimateAudit.org – ClimateAudit.org, the 2007 Weblog Awards winner, reports regularly on climate science, and separates the science from the politics and religiion.
- Founders of Biological and Medical Science – This site commemorates the contributions made to modern science and medicine by brilliant scientists of the past. It focusses five such persons: Edward Jenner, Louis Pasteur, Robert Koch, Ignaz Semmelweis, and Joseph Baron Lister.
- Junk Science – A general science site: much-needed articles debunking contemporary pseudo-science.
- Leonardo da Vinci – Leonardo Exhibit at the Boston Museum of Science
- Natural Science Overview – Natural Science Overview and History
- The Science and Environmental Policy Project
- Watts Up with That – Anthony Watts blogs regularly on the scientific evidence, the politics, and often the denial of evidence, behind claims of "climate change."