Image of Roses
Science

Will Flowering Plants Take Over the World?

Flowering plants arrived relatively late in geological time, between 290 to 145 million years ago. But once here, they evolved quickly and often displaced many other types of plants. In fact, in terms of species, flowering plants are the dominant plant form on Earth today with more than 300,000 types. Learn how their unique reproductive mechanisms led to this explosion of speciation in such a relatively short time.
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hieroglyphics and english pronunciation
Ancient History

Learn How To Write Your Name In Hieroglyphics

Ancient Egyptian civilization is undoubtedly one of the most fascinating chapters in human history. While remnants of the culture like temples, obelisks, and sarcophagi continue to mystify us, you can unlock their true meaning if you know how to read hieroglyphs. […]

image of multiplication table
Applied Math

A Cool New Way to Grasp Basic Multiplication

In this lecture from The Power of Mathematical Visualization, professor James Tanton teaches intriguing new ways to perform basic multiplication — methods that teach you to visualize numbers in a whole new light. […]

image of the eagle nebula by the hubble telescope
Astronomy

Hubble Images—Exploring the Birthplace of Stars

Among the incredible Hubble cloud images, none has been received with greater public acclaim than the detailed 1995 snapshot of newborn stars emerging from giant pillars of gas and dust inside the Eagle Nebula. This image looks like a fantasy landscape out of a dream or a children’s story. Get ready to explore this image in the context of galactic interstellar clouds, the process of star formation, and the impact of young stars on their interstellar environments. […]

Image of ancient greek language carved in stone building
Ancient History

What Did the Ancient Greek Language Sound Like?

The Ancient Greek language is a language like no other. It records an astonishing array of great works in different genres, stretching across a thousand years of history. Watch lecture 1 from the series Greek 101: Learning an Ancient Language, and you’ll learn the 24 letters of the Greek alphabet using the restored classical pronunciation. […]

European History

The Ukraine-Russia Crisis Explained

Survey the recent crisis in Ukraine and see how the origins of this conflict stem from the last hundred years of the region’s history, which is rife with skirmishes and shifting borders. After providing the historical context, Professor Liulevicius explains the ins and outs of the current crisis, including ethnic divisions within Ukraine and Russia’s attitude toward former Soviet territory. […]

Engineering

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

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. […]

Image of Mother Mary and Baby Jesus
Historical Approaches

What Can The Apocrypha Teach Us About Mary?

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. […]

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