Through a variety of physical and theoretical situations, learners are led through the development of some of the deepest concepts in high school mathematics. Complex numbers, the fundamental theorem of algebra and rational exponents...

Surprise! is the theme of this series of ESL lessons. Cover an array of topics such as where we live, different times of day, shapes, the city and the country, what we do for fun, jobs, and games, all while practicing how...

The brother-sister pair Carlos and Clarita need your class's help in developing their new pet sitting business. Through a variety of scenarios and concerns presented to the siblings, the learners thoroughly explore systems of equations...

Get things moving with this elementary science unit on simple machines. Through a series of nine lessons including teacher demonstrations, hands-on activities, and science experiments, young scientists learn about forces, motion,...

Second graders investigate the concept of a balanced diet and how the food pyramid is organized. They conduct research using the links included in the instructional activity. They differentiate the parts of the pyramid while looking at...

Scholars examine, cut, paste, and sort 12 images featuring different types of movement in order to show what they know about energy—potential and kinetic. 

This science presentation focuses on the elements in the periodic table. It begins with the parts of an atom, explaining atomic mass and atomic number, valence electrons, and isotopes. Then it moves on to discuss various ways of...

All waves will reflect and refract in the right circumstances. The reflection and refraction of light explain how people see images, color and even optical illusions. This tutorial discusses each concept and presents an experiment to try...