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 explore the topic of cross-site scripting, (or XSS)

In this animated object, learners study the operation of a ladder circuit that controls the rotational direction of a DC motor.

In this interactive learning object, the student matches the names of software with their definitions and categorizes computer terms according to the appropriate software.

Identify your self-awareness score. In this learning activity, you'll answer 24 questions that attempt to measure three factors relating to self-awareness: introspection, public self-consciousness, and social anxiety.

In this animated object, learners examine how to use a programmable logic controller as an alternative to hardwiring a ladder logic circuit.

In this learning activity, you'll explore what malware is, what the different types of malware are, and how you can protect your computer from these threats.

In this animated object, learners examine the operation of a feed-forward control system and its advantages over a closed-loop system. A brief quiz completes the activity.

Learners consider the most common types of electromagnetic waves and the kinds of hardware used in a wireless network. A short quiz completes the activity.

In this learning activity you'll discover how visual perception is influenced by what's surrounding an image.