In the introduction to this site we learn that, "A fundamental result of geometry, used often in secondary and collegiate mathematics, is the equality of ratios of corresponding sides in similar triangles." Accordingly, this concept is expected knowledge of students in physics, engineering, and the sciences, "since its simple statement is rather useful in finding unknown lengths of elementary...

Getting students interested in applied and practical uses of math and science can be easier than having students just learn basic principles, although those remain very important to be sure. Almost ten years ago, NASA began their own online journal of just such examples for students, and titled it “Practical Uses of Math and Science”, or PUMAS. The project continues to be going strong, and...

Designed and maintained by Elizabeth Stapel, an educator and holder of an advanced degree in mathematics, Purplemath contains hundreds of lessons designed to help students who might be having trouble with algebra. As Stapel notes on the site’s homepage, “These lessons emphasize the practicalities rather than the technicalities, demonstrating dependable techniques, warning of likely “trick”...

Professor Richard M. Felder has been involved in teaching engineering for over thirty years, and his column has appeared in the journal, Chemical Engineering, since 1988. Professor Felder retired several years ago, but he has made a point of continuing with his rather timely and useful updates about the world of teaching in the college classroom. Visitors to this site can scan through some of his...

The Responsive Classroom addresses some of the challenges present in any elementary classroom, be it first-grade mathematics or third-grade science, by offering "an approach to teaching and learning that fosters safe, challenging, and joyful classrooms and schools, kindergarten through eighth grade." Through this website, classroom teachers share "practical strategies for bringing together social...

Rethinking Schools, founded in 1986, publishes educational materials, including this online version of its quarterly journal. The organization is "firmly committed to equity and to the vision that public education is central to the creation of a humane, caring, multiracial democracy." Although the journal features articles of interest to a broad audience, they focus on problems facing urban...

This website promotes the Russian Academy of Sciences' International Institute of Earthquake Prediction Theory and Mathematical Geophysics's incorporation of modern mathematics with seismology and other geologic sciences. Users can discover the Institute's current and past research in earthquake prediction, seismic risk, structure of the Earth, exploration of mineral deposits and much more. While...

The Mathematical Association of America (MAA) continues to build on their already solid online presence with the addition of this lecture by noted mathematician and scholar Professor Ruth Charney. This particular lecture was given at the MAA's Carriage House Conference Center in the fall of 2008 and it deals with how cubes can be used to represent a variety of systems. As Charney notes, "The...

This website from the Children's Discovery Museum (CDM) in San Jose, California, offers a variety of interactive tools and games for children ages 4 to 10 years. The mathematics game featured is a card game called Arithmetic Rummy and requires a printer, while other features are more graphic-oriented. For example, an interactive video takes children through a short journey about energy, while...

The tag line of the Saylor website is "Harnessing Technology to Make Education Free." The site is the brainchild of MIT graduate and founder of MicroStrategy, Michael Saylor. Visitors will find that this online education resource is a little different than some other websites that offer free online courses. Although Saylor.org does not grant degrees, students can download a certificate of...