The applet simulates various vector fields, including spherical, radial, and constant plane. It is a generalized version of an electrostatic field simulation by the same author. The field strength and number of particles simulated are adjustable. Divergence, curl, and potential can be color-coded. Grid lines, potential lines, or streamlines can be displayed. Directions, specific links to the subject and source code are also included.

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.

When a pair of scientists first introduced cold nuclear fusion in 1989 as a source of almost limitless energy, the scientific community quickly discredited the experiments. In some venues, these experiments are case studies in faulty scientific investigation. But now a respected scientist at SRI International is doing extensive research on the same process -- with promising results. This 12-minute investigative report by CBS 60 Minutes explores the renewed interest in cold fusion and its implications for society. This resource is available for free online viewing. A four-page text synopsis is also provided. It could be especially useful as a springboard for a lesson on the importance of objectivity in scientific experimentation.

This Astronomy Picture of the Day (APOD) image shows a laboratory test of the ion drive engine used to propel the Deep Space 1 exploratory probe across the solar system in 1998. The site includes a description of how the device works and provides links for related information.

This Astronomy Picture of the Day depicts the Himalayan mountain range in Nepal. The image was taken from the International Space Station. Links provide background information about Skylab, the Himalayas, and plate tectonics.

This webpage from Wayne's Word provides basic information about dust storms, including how they are formed and the problems they cause. Recent dust storms in New South Wales, Australia, are described. Several photos of dust storms are included.

The Acid Strong Base Titrations model show how to estimate the concentration of the acid in a given sample. If one follows the titration by a visual indicator, the neutralization is detected through a sudden change of that indicator color. This model shows the titration curve as a strong monofunctional base (sodium hydroxide, for example), is added to an aqueous solution of a monoprotic acid. The Acid Strong Base Titrations model was developed using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the jar file will run the program if Java is installed. You can modify this simulation if you have EJS installed by right-clicking within the map and selecting "Open Ejs Model" from the pop-up menu item.

This guide accompanies an educational wall-sheet that uses Active Galaxies as an engagement to teach selected topics in physical science and mathematics. Active galaxies have super-massive black holes in their cores, some of which emit jets of particles and light. The guide was developed by the Sonoma State University Education and Public Outreach group to support the Fermi Gamma-ray Space Telescope, formerly the GLAST mission. The Active Galaxies Educator Guide features three curriculum enhancement activities, background information, assessment information, student worksheets, extension and transfer activities, and detailed information about the physical science and mathematics content standards. This is part of a collection of resources provided by the Space Science Education Resource Directory, and has passed a SSERD Panel Review.

The Airborne Infection SEIR Model examines the time evolution of four populations in an epidemic: those who are susceptible to infection, those who have been exposed but do not yet exhibit symptoms, those who are infected and contagious, and those who have recovered from the infection. The SUSCEPTIBLE-EXPOSED-INFECTED-REMOVED (SEIR) Model shows that infection can spread throughout a population in just a matter of days. Infections and viruses can be transmitted relatively easily, or can be prevented all together if certain conditions are satisfied. This model examines the spread of infection in indoor environments and the parameters that shape its transmission. The Airborne Infection SEIR Model was developed using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the jar file will run the program if Java is installed. You can modify this simulation if you have EJS installed by right-clicking within the map and selecting "Open Ejs Model" from the pop-up menu item.

Algebra One on One is a shareware educational game that teaches users about algebra. Game or practice options are available to test knowledge of the 21 functions covered. Different educational levels, including a help system for beginners, are available.

This web page outlines a student activity on atoms and the periodic table. The assignment includes instructions about how to write a children's book for 3rd and 4th graders on the topic of the elements from the cover to the end of the book. It is a performance-based activity designed to promote critical thinking about atomic and molecular structures as students characterize and model the structures in a storybook format. Grading rubrics are also included.

In this activity, students will explore how the Law of Conservation of Energy (the First Law of Thermodynamics) applies to atoms, as well as the implications of heating or cooling a system. This activity focuses on potential energy and kinetic energy as well as energy conservation. The goal is to apply what is learned to both our human scale world and the world of atoms and molecules.

This Astronomy Picture of the Day captured an aurora from the ground in Antarctica. Also in the frame are buildings housing scientific instruments. Text and links provide further information.

This resource is an online textbook containing information about Nuclear Magnetic Resonance (NMR). Information inlcudes mathhematics of NMR, spin physics, Spectroscopy, pulse sequences, and NMR hardware. The "Practical Considerations" chapter emphasizes spectroscopic techniques.

This site from the NASA Glenn Research Center offers a brief introduction to propulsion with many links to explore related concepts in depth. Topics include Newton's laws, thrust, aerodynamics, thermodynamics, basic math concepts, propulsion systems, and more. Users can navigate the site through links to other pages of interest, but there are also links to guided tours and an index at the bottom of the portal page.

This page from the 2006 Biomedical Image Awards provides an image by Arindam Chaudhuri showing stress in an aneurysm, a ballooning of an artery due to weakness in its wall. What is pictured is actually a three-dimensional model, made of latex, that was illuminated with polarized light to reveal the stress in the aneurysm. Text on the page provides further information.

This web page describes different aspects of designing bridges. It relates the concept of bridge designing with the real life scenarios. It also includes some bridges around the world and gives some specifications of them.

This page from CERES (Center for Educational Resources Project) features classroom-ready lessons for K-12 classes, developed by a team of master teachers, NASA researchers, and university faculty. The activities are designed to integrate themes and unifying concepts in science with astronomy objectives, and provide concrete experiences for observation, comparison, and organization of data about our solar system and the Milky Way galaxy. Lessons are organized by grade bands: K-4, 5-8, and 9-12. Some integrate NASA data to allow students to construct first-hand knowledge of the universe. All lessons are aligned to the NRC National Science Education Standards.

Investigating candle flames in microgravity can be done as either a demonstration or an activity. "Student reader" pages give background information about candle flames in microgravity. Student worksheets may be used to assess student learning.

The EJS Cellular Automata (Rule 90) model displays a lattice with any one of a finite number of states which are updated synchronously in discrete time steps according to a local (nearby neighbor) rule. Rule 90 is a specific nearby neighbor rule following the classification scheme developed by Stephen Wolfram that produces a Pascal triangle mod 2 (Sierpinski gasket) if there is a single initial cell with a value of one. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting “Open Ejs Model” from the pop-up menu item. The Cellular Automata (Rule 90) model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_ms_explicit_Automata1DRule90.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.