University of Colorado
University of Colorado: Physics 2000: Einstein's Legacy: Laptop Screens
A series of seven pages that describe how screen displays on laptop computers work using polarized light in a liquid crystal display. Interactive Java applets.
Florida State University
Florida State University: Molecular Expressions: Measuring With Shadows
You can use shadows and a meter stick to measure very tall objects from the ground--and before you try this experiment yourself, see how it works with a Java applet that measures the height of a Tyrannosaurus Rex.
National Council of Teachers of Mathematics
Nctm: Illuminations: Mars Earth Orbit Computer Activity
Students will use this applet to form and test hypothesis of what the orbit of Mars will look like relative to Earth. [Requires Java.]