Would mathematics exist if people didn't? Did we create mathematical concepts to help us understand the world around us, or is math the native language of the universe itself? Jeff Dekofsky traces some famous arguments in this ancient...

A video entitled “Introducing Solids” that recognizes the key attributes of cubes, cones, cylinders, and spheres.

In this video, the teacher explains the terms used to describe three-dimensional figures. They discuss the difference between one-dimensional, two-dimensional, and three-dimensional figures, and how to identify the faces, edges,...

This video explains the formation and identification of minerals. Major mineral groups, basic crystal systems, the physical properties of minerals, and everyday uses of minerals are discussed. Other terminology includes: inorganic,...