Learners examine how the National Debt occurs and trace its history from the time of the Revolutionary War through the present.

In this learning activity you'll examine how network address translation works.

Learners examine the anatomical parts of the lungs.

The student identifies the anatomical parts of the ear and learns the purpose and function of these parts. A review follows the lesson.

In this animated and interactive object, learners identify the valves and chambers of the heart.

In this interactive and animated object, learners follow instructions for finding the lowest common denominator for a group of algebraic fractions. Immediate feedback is provided. This activity has audio content.

In this screencast, learners review the parts of the gastrointestinal system and then check their knowledge in a matching exercise.

In this learning activity you'll discover different communication styles from around the world.

In this learning activity you'll identify points on a coordinate system.

This learning object describes the production of an alternating current in a generator with a single-loop armature. An illustration of how a sine wave is produced is shown through animation.

In this learning activity you'll determine appropriate feasibility studies from a list of selected topics.

The user completes a fill-in-the-blank exercise to review the anatomy of the heart.

In this interactive object, learners change the amount of money received from tax revenue and the amount spent on federal programs as they calculate how fiscal policy affects the gross domestic product (GDP), unemployment, inflation, the annual deficit, the national debt, and interest on the national debt.

In this animated object, learners examine how to align a part on the 1808 CMM.

This project gives a drawing with steps to complete the activity.

In this screencast, you will learn about the 24 time zones.

Learners view an animated demonstration of how to determine the final output of the combinational circuit.

In this interactive object, students view the various positions used during medical examinations. They then match the names of the positions with the correct images and with their descriptions.

Students identify the various regions of the human body through video.

Thousands of health and beauty products claim to be cruelty free - but do you know how to spot a fake? Test your knowledge and explore the exciting science that's delivering cutting-edge and better alternatives to animal testing in this interactive experience. Make decisions as both a beauty blogger and a research scientist as you navigate animal testing in the health and beauty industry.