An electronic reference about the Earth, its natural
environments, and their interaction with society. The
Encyclopedia is a free, fully searchable collection of articles
written by scholars, professionals, educators, and experts who
collaborate and review each other's work. The articles are
written in non-technical language and are useful to students,
educators, scholars, professionals, as well as to the general
public. The Knowledge Project is an effort to work with the
science academic community to build a reliable, openly
accessible library of peer reviewed educational science content
for college and high school students. Each article is written by
experts in their field and then reviewed and vetted by other
experts. The Best Education Site has a selected list of
educational websites and educational links in many disciplines
including astronomy. SciTopics is a free, wiki-like knowledge-
sharing service for the scientific community. It offers
distilled, authoritative and up-to-date research summaries on a
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