The Standard Model of Fundamental Particles and Interactions Chart, Flash version, copyright 1999 by the Contemporary Physics Education Project.

Phylogeny is the organizing principle of modern biological taxonomy, and a guiding principle of modern phylogeny is monophyly: a monophyletic group is considered to be one that contains an ancestral lineage and all of its descendants. Any such a group can be extracted from a phylogenetic tree with a single cut. The tree shown here provides a guide to the relationships among the major groups of the extant (living) organisms in the Tree of Life. We include three groups that are not believed to be monophyletic; these are designated with quotation marks. The tree does not include viruses or prions.

An ungulate is any hooved animal. The goal of the Ultimate Ungulate Page is to provide reliable information, pictures, and links for all of the world's ungulates to the global online community. These pages have been created for educational use, and may be printed by anyone and everyone.

A beginner's guide to understanding the issue of global warming. Covers the Greenhouse Effect, scientific evidence, skeptics, and the Kyoto Protocol. Published by the Woods Hole Research Center.

Welcome to the World's Biomes Page! Biomes are defined as "the world's major communities, classified according to the predominant vegetation and characterized by adaptations of organisms to that particular environment" (Campbell). Biomes are classified in various ways. This page will group biomes into five major types: Aquatic, Deserts, Forests, Grasslands, and Tundra. These exhibits explore the ancestor/descendant relationships which connect all organisms, past and present. The importance of biomes cannot be overestimated. Biomes have changed and moved many times during the history of life on Earth. More recently, human activities have drastically altered these communities. Thus, conservation and preservation of biomes should be a major concern to all. Hopefully, this page will increase your general knowledge of biomes. For further information, please consult the references page.

The most complete collection of Darwin's work ever published - with original page numbers, illustrations etc., organised by John van Wyhe at the University of Cambridge.

This is the interactive online edition of the book of the same name, published by the US Geological Survey. The online edition contains all text from the original book in its entirety. Some figures have been modified to enhance legibility at screen resolutions.

Tsunami! is a University of Washington website that has been developed to provide general information about tsunamis. Tsunamis are large water waves, typically generated by seismic activity, that have historically caused significant damage to coastal communities throughout the world. This site has been developed with a broad audience in mind; consequently, it contains extensive background information that is intended primarily for the general public, including information about the mechanisms of tsunami generation and propagation, the impact of tsunamis on humankind, and the Tsunami Warning System. This site also contains more detailed information about recent tsunami events that will be of interest to tsunami and interdisciplinary researchers.

Welcome to ETI - Turtles of the World. These pages provide basic information about turtles, plus a sample of the Turtles of the World CD-ROM (by C.H. Ernst, R.G.M. Altenburg and R.W. Barbour). Turtles are the only living members of the subclass Anapsida, which is characterized by a primitive skull with a solid cranium and no temporal openings (anapsid). These shelled reptiles constitute the order Testudines. All living shelled reptiles are turtles, but the terms tortoise and terrapin have also been applied, and these have different meanings in various parts of the world. Tortoise is best applied to terrestrial turtles. Terrapin is usually applied to edible, more or less aquatic, hard-shelled turtles....

Welcome and thank you for visiting the Ultimate Tree-Ring web pages, designed to be the ULTIMATE source for information on the science of Dendrochronology. I've designed these pages to be easily understood by people at all levels of education, from elementary school students to high school students, from first grade teachers to college professors. You won't find anything fancy here - I want these pages to be readable, enjoyable, and (most of all) educational.

Understanding Evolution is a non-commercial, education website, teaching the science and history of evolutionary biology. This site is here to help you understand what evolution is, how it works, how it factors into your life, how research in evolutionary biology is performed, and how ideas in this area have changed over time. What is evolution and how does it work? How does evolution impact my life? What is the evidence for evolution? What is the history of evolutionary theory?

An interactive journey though Earth's history for students and educators.

The Universe Forum is the national center for teaching and learning about the structure and evolution of the universe. Sponsored by NASA and based at the Harvard-Smithsonian Center for Astrophysics, the world's largest center for astrophysical research, the Forum uses the unique resources of NASA's space science research program to create exciting learning experiences for students, teachers and the public.

Consider the immense pressure put on the environment. Researchers Bill Rees and Mathis Wackernagel have developed the ecological footprint conceptthe area of land needed to provide the necessary resources and absorb the wastes generated by a communityto highlight the impact of cities on the environment. This site explains the science behind the term 'ecological footprint' and provides links to numerous related websites. Hosted by the Global Development Research Center.

The U.S. Department of Energy's (DOE) Office of Scientific and Technical Information (OSTI) provides access to a wealth of energy, science, and technology research and development (R&D) information from the Manhattan Project to the present.