Earlier I posted about Wolfram Alpha, the computational search engine that has changed my thinking about what we should be teaching math students. A related project is Wolfram Demonstrations.
By downloading and installing the Mathematica Player (a free download available for Windows, Mac, or Linux), users can download and run animations that are built in Mathematica (a program used by professional scientists, mathematicians, and engineers). There are thousands of animations that have been written by and posted by programmers with a wide range of experience and perspectives and for an equally wide range of audiences.
Most demonstrations are designed to help students visualize an idea (an equation, an experiment, a model) and manipulate it so they can see how changing a variable changes the visualization. Here is a a typical example of the kind of demonstration that may be useful to a middle school math class:
Click here to visit the page.
There is a good 2-minute video introducing Mathematica Player on the Mathematica web site.
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