The best option is to subscribe in iTunes for the free download of all of the podcasts (currently there 48). New episodes can be automatically downloaded to your computer. These can viewed on an iPad or similar device, or through iTunes on your computer.
This simulation is intended to help anyone get a better understanding of the relationships between various quantities involved in uniformly accelerated motion. By adjusting the sliders (or input boxes), you can change the initial position, the initial velocity, and the acceleration of an object, and can observe how each change affects the graphs of position, velocity, and acceleration vs. time.
This is a simulation of diffraction of light by a double slit. Use the sliders to adjust the distance between the slits and the wavelength of the light. Use the checkboxes to show or hide the wavefronts, maxima, and vertical scale. Use the Show Interference Pattern button to create the interference pattern that would be seen on the screen. Note that the distances in the simulation are all very small, so that you can see the wavelength separations. The y distances shown in the scale and the distance from the slits to the screen (L) are proportional, so they can just be thought of as meters or any other convenient unit.