A two-paragraph informative text takes a close look at the color green. Scholars listen to and or read the passage, then answer five multiple-choice questions. A progress report details learners' performance.

An interactive tests scholars' reading comprehension skills. After reading or listening to a brief informational text, learners answer five fill-in-the-blank questions. Results appear instantly.

Test scholars' reading comprehension skills with interactive practice. Learners read a short informative text about rainbows, then answer eight multiple-choice questions. A report details their progress after the exercise is complete.

Test scholars' comprehension with a 10-question interactive. Learners read a short informative text about Sequoyah, a Cherokee silversmith, who invented the language Cherokee Syllabary, then answer fill-in-the-blank and multiple-choice...

A short informative text shares details about the Arctic Fox. Scholars read or listen to the text then answer 10 multiple-choice questions.

This is a complete, full-year Algebra 1 course with interactivity included in every lesson. Some lessons include videos, and all include interactives and inline questions that offer instant, per-answer feedback. Every lesson also has...

Play hockey with electric charges in this interactive electric hockey simulation. Place charges on the ice, then hit start to try to get the puck in the goal. As the game is being played, view the electric field, and trace the puck's...

Use the lead lab to take an in-depth, interactive look at the foundation of news stories: the lead. Flash Player is required.

Learn about sound waves, which move vibrations from one place to another through liquids, gases and solids, with this interactive lesson.

Investigate graphs of polynomial functions, tangent lines, derivatives, and area under a curve with this interactive applet.

Identify real-world cases of boundary interactions and predict the most likely future geologic outcomes. In the lightning round, unscramble four geologic terms.

Practice for the MCAT with these questions about cell-cell interactions.

Follow this two-part interactive tour of the brain. The first gives you brain basics; the second shows how the brain is affected throughout the stages of Alzheimer's disease.

This digital textbook covers core physics concepts and includes interactive features, real world examples, videos, and study guides.

An interactive simulation that teaches about ratios, proportional reasoning, and using double number lines to look for patterns through interactions while shopping for fruits, vegetables, and candy and by comparing cars with different...

How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today. What happens when you add clouds? Change the greenhouse gas concentration and see how the temperature changes. Then compare to the effect of...

An interactive simulation that teaches about blackbody, sun, light, and quantum mechanics. Students learn my making observations while changing the temperature with a sun, a light bulb, an oven, and the Earth in order to see the changes...

An interactive simulation that teaches about buoyancy and density by applying various forces and modifying the properties of objects and fluids. This simulation can either be downloaded or played online and includes handouts, lesson...

An interactive simulation that teaches about photons, monochromatic light, white light, and rainbows through changing wavelengths, beams, filters, and color combinations. This simulation can either be downloaded or played online and...

An interactive simulation that teaches about graphing, polynomials, and curves by adjusting the constants to observe the effect on the shape of the curve. This simulation can either be downloaded or played online and includes handouts,...

An interactive simulation that teaches about friction, thermodynamics, and heat by making observations while rubbing two objects together. This simulation can either be downloaded or played online and includes handouts, lesson plans, and...

An interactive simulation that teaches about functions, transformations, and ordered pairs while identifying patterns through art history. This simulation can either be downloaded or played online and includes handouts, lesson plans, and...

An interactive simulation that teaches about oscillators, normal modes, and polarization by varying the number of masses and initial conditions to determine their effect on 1D or 2D systems of coupled mass-spring oscillators. This...

An interactive simulation that teaches about chemical reactions and limiting reactants by creating sandwiches to represent chemical reactions. See how many can be made using different amounts of reactants. This simulation can either be...