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One of the contributing editors introduces the Developers' Area.

This interactive Geogebra applet allows exploration of a linear transformation in terms of images of a set of points. The Geogebra interface allows dragging of points and vectors to make for versatile explorations of basic linear algebra ideas. Suggested activities are included.

A Biological ESTEEM module in the Phylogenetics Category. This worksheet simulates the molecular evolution of DNA sequences.
This interactive, browser-based game provides students with a great activity for the "reform calculus" problem of finding "function-derivative pairs" based only on graphs. Several variations are available.
This is a module for use in differential or integral calculus. It looks at a differential equation model for world population growth.
Guidelines for Loci reviewers -- including evaluation criteria and summary results.
The dihedral group D8 (sometimes called D4), the group of symmetries of the square, is one of the simplest finite groups. In these three mathlets, we will explore different aspects of this symmetry group to get a better understanding of its structure.

A module that uses Riemann sums and other numerical methods to investigate of the area of a complex region, specifically, a map of Virginia

An article describing the WWW Interactive Mathematics Server (WIMS), designed for supporting intensive mathematics work via the Internet with server-side interactivity.
This article highlights several new modules in the ESTEEM collection maintained by the BioQuest Curriculum Consortium.