This interactive addresses the question if we can reduce CO2 emissions by 20% of 1990 levels and help avoid dangerous climate change? Users of this interactive can manipulate changes to various sources and uses (supply and demand) of energy with the goal of reducing C02 emissions in Great Britain by 80% in the year 2050.

Created by David Lane of Rice University, this applet simulates experiments using 2 x 2 contingency tables. You specify the population proportions and the sample size and examine the effects on the probability of rejecting the null hypothesis. The author provides instructions and then five different exercises to practice these concepts. Overall, this is a nice interactive resource that allows users a more hands-on approach to statistics.

This simulation illustrates a wide range of 3D vector fields, including spherical, radial, and linear. The fields can be displayed as vectors, particle trajectories, equipotentials, and other options. The number of particles, vectors, or streamlines, and the field strength are adjustable. Directions and source code are also included. This is an extension of a 3D Electric and Magnetic Field viewer from the same author.

Acid-Base titration applet that plots pH changes as student adds acid or base. Gives choice of indicators (only two right now). Compares plots for titration of traditional solution and a buffered solution (several choices for comparison). Can alter starting concentrations.

In this outdoor game, learners play the roles of gray or red squirrels gathering and storing a supply of food in "fall" and recovering enough of them to survive the "winter." Learners carry bags representing their cheek pouches for carrying food. Learners investigate the advantages and disadvantages of how these two kinds of squirrels store food differently.

In this activity, learners simulate taking HIV antiretroviral drugs by using Tic Tac mints and Kool-Aid packets. Learners will experience firsthand how easy or difficult it is to fully adhere to a treatment program. Participation in this activity does not require eating or drinking anything and can accommodate learners with allergies.

In this activity, learners simulate Otto von Guericke's famous Magdeburg Hemispheres experiment. In this modern, low cost version, a pair of learners try to pull apart two suction cups (dent pullers). Learners then calculate the amount of force holding the dent pullers together.

The Materials Science and Technology Teacher's Workshop (MAST) provides this activity for classes learning about diodes and electrical currents. The laboratory illustrates how diodes can be used to rectify alternating current. It uses a galvanometer to determine the direction of current flow when an AC or DC current is applied to the circuit containing a diode in series with a resistor and a galvanometer.The lesson includes step by step directions for the experiment.The activity should require about 20-30 minutes of class time to complete. Discussion questions and teacher notes are included.

This module focuses on the basic concepts involved in dynamic electrochemistry when the net current is not zero - the combination of mass transfer and electrochemical reactions at the interface between solids and fluids. It is at an introductory level appropriate for undergraduates in their sophomore or junior years.

The Analytical Sciences Digital Library (ASDL) provides a collection of peer-reviewed web-based educational resources related to technical resources in the analytical sciences. Materials include articles, labware, educational practices, and more.

In this outdoor winter activity, learners search for and create hibernation sites that will protect gelatin "animals" from freezing. Learners come to understand that hibernating animals need to take care in selecting a sleeping spot that will provide protection from the winter cold.

The National Oceanic and Atmospheric Administration's (NOAA) polar-obriting satellites monitor the ozone levels around the globe. The ozone layer acts to protect life on Earth by blocking harmful ultraviolet rays from the sun. The "ozone hole" is a severe depletion of the ozone layer high above Antarctica. It is primarily caused by human-produced compounds that release chlorine and bromine gases in the stratosphere. NOAA scientists reported that the 2006 ozone hole in the polar region of the Southern Hemisphere broke records for area and depth. In this animation, the POES satellite sensors document the change in the ozone hole over Antarctica. In the critical layer of the atmosphere between 8 and 13 miles, nearly all of the ozone has been destroyed. However, large declines in the ozone hole, such as the one in 2006, are common year-to-year variations caused by Antarctic stratosphere weather fluctuations. Overall, the ozone hole is estimated to decrease annually very slowly in area by about 0.1 to 0.2 percent for the next 5 to 10 years.

This website, created by Paul Trunfio and Gary McGath of Boston University's Center for Polymer Studies, provides the description and instructions for the the Anthill and Molecular Motion Java applet. Some of the topics covered include: mixing, diffusion, and contour plots. Overall, this is a fine resource for any mathematics classroom, especially one interested in statistics.

This game is a part of the Tau Pack of the Kinetic City site (see description below). In this simulation, the patient's bodies are filled with bacteria. The object is to cure as many patients as possible. Learning concepts enforced here are that antibiotics are specific for the type of bacteria they treat, their strength, and that the bacteria may also become resistant to the bacteria by mutations.KINETIC CITY DESCRIPTION: "Kinetic City" (www.kineticcity.com) is a fun, Web-based after-school science club for kids, ages 8 through 11. It combines exciting online animations and activities with boxes of hands-on science experiments. Children earn "Kinetic City" power points and collect stickers as they complete missions and learn standards-based science content. Here's how it works: The "Kinetic City" super crew (Keisha, Curtis, Megan and Max) needs the help of Earth kids to save their planet Vearth, from the science-distorting computer virus Deep Delete. Each of Deep Delete's 60 hideous strains attacks a different area of science with disastrous consequences. After each attack, teams of Earth kids fight back by viewing a short online animation describing the situation on Vearth; performing a series of activities to re-learn the lost science and going on a mission to Vearth during which they answer science questions and gobble up Deep Delete viruses. Their scores appear on their own Kinetic City Club Web page. "Kinetic City" is produced by the American Association for the Advancement of Science (AAAS), with a grant from the National Science Foundation. AAAS writes the "Project 2061 Benchmarks for Science Literacy," which forms the basis of most state science standards.

NASA argues that new observations may upset theories about how solar explosions create and destroy antimatter. Users can view the many colorful animations and short movies obtained from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI).

Learn the relationship between perimeter and area. A shape will be automatically generated with the perimeter that you choose. Calculate the area of this shape. Area Explorer is one of the Interactivate assessment explorers.

This 5-minute video addresses the relationship of the measures area and perimeter. It gives several examples of rectangles that have the same area measure and different perimeters. Labels are shown and calculations explained.

Students play a generalized version of connect four, gaining the chance to place a piece on the board by answering arithmetic questions (addition, subtraction, multiplication, division). Parameters: time, difficulty level, types of questions. Arithmetic Four is one of the Interactivate assessment games.

Teachers: Have you and your students ever come upon a question with no easy, well-defined answer. If so, then this site from Arizona State University is for you. Intended for K-12 teachers, users can submit a question and, within three days, receive an answer. Also helpful are the Experiments and Stuff, Articles and Profiles, and Web Links sections. The site's guidelines section stresses that the scientists who answer questions for Ask a Biologist are volunteers, but most are acting scientists. Due to volume of questions, or how busy a given scientist is, response time may be a bit slower than the promised three days. A great resource though for those times when you'd like an explanation from an expert and you don't have one handy.

The Art Studio Chalkboard, provided by Ralph Larmann of Southern Arkansas University, has been designed as a resource focusing on the "fundamentals of perspective, shading, color and painting." Organized by Drawing, Painting, Sources and Resources, and Responses to Visitor's Questions, this site contains text and illustrative graphics on drawing grids, using chiaroscuro, optical color mixing, stretching canvas, spiral staircase perspective and pointers to other sites such as Eyes on Art. What makes this site unique is its how-to, illustrative approach written in plain English.