This slideshow gives an advanced-level explanation of how to calculate the distance that tectonic plates move by using Physics formulas and concepts. Includes a discussion of marine magnetic anomalies and how these impact plate movement....

Topics covered in this slideshow include the Earth's interior, seismic S- and P-waves, the crust and mantle, phase boundaries encountered by seismic waves, the Earth's internal heat, gravity and density, gravitational anomalies, the...

Take a tour of the human skeleton and see computer images of various bones of the body, including the normal bone and bones that have anomalies.

This site provides an image of M.C. Escher's lithograph, "Convex and Concave," which can be enlarged by clicking on it. Included is a brief quote, "from the text of M.C. Escher - the Graphic Work," which provides some insight into...