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A Biological ESTEEM module in the Evolution Category. These two workbooks model the evolution of phage resistance in a bacterial population under two alternative hypotheses.
This is an article describing the author's experiences using the Duke Connected Curriculum materials
Three applets allow you to interact with the puzzle described in the April 2009 Mathematics Magazine article by Alex Fink and Richard Guy.
A Biological ESTEEM module from the Ecology Category. This Excel workbook demonstrates the principles of the MacArthur-Wilson theory of Island Biogeography.

Marden's Theorem concerns the relative positions of the roots of a cubic polynomial and those of its derivative. This article gives a proof of Marden's theorem, along with dynamic geometry animations and some of the history of the result.

A Developers' Area article about reuse and interoperability of mathematical tools.
Loci has a new Editor!
This Flash Forum article includes source code and instructions for building a truth table applet and other applications requiring parsing and evaluation of logical expressions.
These applets provide interactive student activities to make connections between the graphical and analytical interpretation of "completing the square" and writing the equation of a parabola in general and standard form.

A mathlet that illustrates the relationship between the graphs of the natural sine and cosine curves and the vertical and horizontal coordinates of points on the unit circle.