Did you see that or did I imagine it? Optical illusions are often created with mirrors and lenses, and here is a presentation that covers many different types of mirrors and lenses and how they work. Flat, concave, and convex mirrors, as...

Take a walk through time, 1852 to 1994, following the mathematical history and development of the Four-Color Theorem. Learners take on the role of cartographers to study an imaginary world of countries that need to be...

Intended to be used along with the first chapter of An Introduction to Language textbook, this PowerPoint is full of linguistic terminology that is not necessarily explained. This tool can be used to complement a lecture or a text, but...

The Roaring Twenties was a time of great prosperity in America and Virginia. However, it ended with a bust that shook our country to its core. Imagine the culture of this time with the help of pictures, charts, and maps. This slideshow...