In this learning activity you'll test your knowledge of global rates for births.

Students examine how voting rates are determined and how those rates change depending upon the population being studied. A brief quiz completes the activity.

In this learning activity you'll calculate exchange rates to determine the impact of prices of exports and imports.

In this learning activity you'll test your knowledge of global rates for marriage.

In this animated object, learners study the operation of a linear voltage differential transformer. A brief quiz completes the activity.

In this animated object, learners examine the circuit configuration and operation of a differentiator operational amplifier. A brief quiz completes the activity.

In this learning activity, you’ll identify information hackers use to gain access to a company, explain different types of social engineering attacks, and recognize different solutions to avoid these attacks.

In this screencast, you'll observe two vehicles moving across the screen at different rates then describe the motion. Additionally, you'll select the corresponding graphs of distance vs. time, velocity vs. time, and acceleration vs. time for each vehicle.

In part 2 of this series, learners follow the steps of the “mathemagician” to examine these numerical curiosities: The 189 Challenge; An Armstrong Number: What’s Special About 153? Is 495 Different or Indifferent? Is 6174 Different or Indifferent? It is always 618, and Beginning and Ending the Same.

Through the use of symbols and words, the learner reviews the etiologies, symptoms, and treatment of respiratory and metabolic acid-base disturbances.

This learning object demonstrates the process by which antigens are identified, processed, and presented to mediators of the cellular immune system.

In this learning activity you'll test your knowledge of global rates for life expectancy, marriage, divorce, and births.

In this learning activity you'll apply information about three different sources of governmental power: Unitary, Confederate, and Federal to world governments.

By the end of this learning activity, you’ll know how to understand, use, and maintain different types of fire extinguishers.

In this learning activity you'll test your knowledge of the different types of steel rules as well as how to use and read them correctly.

In this screencast, learners categorize different metabolic activities as catabolic or anabolic and follow a glucose molecule through the processes of glycolysis, aerobic respiration, and fermentation.

In this learning activity, you'll examine the different ways in which computers and other equipment are physically connected in local area networks and the advantages and disadvantages of each topology.

In this learning activity you'll discover different cultural traditions between East Asian people and North Americans.

In this learning module you'll become familiar with different types of GTAW electrodes.

Students view the mathematical expression of an AC waveform with respect to time (t) and read about the different components of this expression.