Engineering

Alternating Current vs. Direct Current—What’s The Difference?

June 21, 2017

Examine the nuances of alternating and direct currents, see how transformers use electromagnetic induction to transform voltage levels in AC circuits, and observe the role of diodes and capacitors in regulating current. See how the DC power supplies that charge our cell phones are constructed so that they convert alternating to direct current. […]

Virgin Mary and Baby Jesus in a stained glass portrait
Historical Approaches

What Can The Apocrypha Teach Us About Mary?

June 13, 2017

While Mary is present in the Canonical gospels, its really in the early Christian apocrypha that she becomes the leader among the saints. Explore several key texts to uncover what we know about Jesus’ mother, her relationship with the disciples, and what makes her unique among the New Testament figures. […]

American History

Who Helped Fund America? — The History of Robert Morris

June 12, 2017

Money issues abounded in the new United States. Why was the abundance of land (and lack of hard coin) such a problem? What compelled states to print so much of their own unsecure paper money? how did Robert Morris attempt to restore the links between commerce, agriculture, and government finances? […]

Hobby and Lifestyle

The Art of Playing The Guitar

June 11, 2017

In this lecture, we’ll explore techniques for efficiently moving the left hand position, learn how the lower three strings are notated, and then practice how to quickly move between chords. […]

the word STRESS on chalkboard being erased
Health And Fitness

Stress Management: Arousal and Value Judgement

March 22, 2017

Stress management wisdom – Stress is, at its core, how we communicate with ourselves. Instead of being afraid of stress, learn to listen to it and use it as a tool that facilitates self-awareness and self- understanding. Don’t try to reduce or eliminate stress. Instead, as you’ll see in this lecture, learn to make stress work for you. […]

Arts

Drawing 101: Linear Perspective

March 14, 2017

In this lecture, you’ll learn to use linear perspective to draw an architectural landscape of two buildings on a ground plane. Construct the buildings and the space between them using the principles of one-point perspective. […]

British Literature

H. G. Wells and the Quest for Utopia

March 9, 2017

Many of H. G. Wells’ science fiction stories contain fantastical utopian overtones. What was the historical impact of including these utopian settings within the context of his writings? And, relatedly, is there a way to see utopia as being inherently part of the science fiction project? […]

Ancient History

The Dramatic History of Islamic Medicine

March 7, 2017

Al-Razi was known as the father of Islamic medicine — in fact, many of his medical texts became classics that were still consulted in the Middle East and Europe hundreds of years after his death. Examine the life and work of al-Razi, and explore the development of hospitals across the Greater Middle East, and reviews the contributions of another great medical mind, Ibn Sina. […]

woman watering container plants on patio balcony
Gardening

Small Space Gardening — Edibles and Ornamentals

February 17, 2017

Patios, small decks, fire escapes—whatever your space constraints, there are a wealth of container gardening ideas and designs you can enjoy. Taking you through several seasons, this lesson shows you how to take advantage of small spaces to blend ornamentals and edibles (such as tomatoes and blueberries) and come up with creative solutions for everyday gardening challenges, including color balance, privacy with neighbors, and pest control. Adapt each of these techniques as your space allows! […]

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