This introduction to cryptography is a collection of applets including: "Let's Make A Deal," "Let's Make a Deal II," "Monkey Words," "Entropy," "Vigenere," "Rectangular Transposition," and "Monoalphabetic Substitution." This is a wonderful collection of applets for any classroom studying statistics.

To assess the significance of any particular instance of r, enter the values of N[>6] and r into the designated cells, then click the 'Calculate' button. Application of this formula to any particular observed sample value of r will accordingly test the null hypothesis that the observed value comes f more

This page is an overview of the impact of computers on the field of physics. Are computers absolutely necessary for research, especially in physics? In 1987 the Nobel Prize for physics went to Alex Muller and Georg Bednorz for their work on superconductivity which did not require a computer for thei more

Generate simulated experimental data for four studies - Imprinting in Precocial Birds (Rajecki), The Etiology of Schizophrenia (Main), Motivational Factors in Routine Performance (Mueller), and Social Facilitation (Rajecki & Halstead-Nussloch). For each study you have control over the variables that more

Graph is "an open source application used to draw mathematical graphs in a coordinate system." Anyone who wants to draw graphs of functions will find this program useful. The program makes it very easy to visualize a function and paste it into another program. It is also possible to do some mathemat more

This web page is an interactive physics simulation relating to circular motion. The system is a ball on a string, rotating in a circle perpendicular to gravity. The user can change the mass of the weight, or the tension in the string. The ball's velocity and angle relative to the string are calculat more

This webpage contains an interactive simulation that allows users to explore quantum bound states in double potential wells. Users can interactively change features such as the width, spacing, and height of the wells, and see the changes to the energy eigenstates and wave functions continuously. Tim more

This page compares the distance/magnitude/size of various objects or constants. This includes physical dimensions such as the diameter of particles, atoms and biological cells, the height of Mt. Everest, depth of the Earth's crust, distances to planets, stars, and galaxies. Colored histograms are di more

Play this game to learn a lot about force and motion. The goal is to bring the lander down safely on the moon, and also, for variety, on Earth and Jupiter. Among other concepts, the game shows that the acceleration and velocity are very different.