Engineering

Breaking the Sound Barrier and Beyond

During and just after World War II, the quest for ever faster fighter planes reached an apparent natural barrier—the speed of sound. Yet, on approaching this limit, aircraft became unstable and uncontrollable. In this full lecture, discover how a new approach to aircraft design solved the problem of compressibility and shock waves in this transonic region, paving the way for supersonic flight and paved the way to breaking the sound barrier. […]

History

Biological Anthropology—Unpacking Race and Biology

What does it mean to be human? Where did we come from? And what unites us in our diversity today? As the world population continues to explode, these big questions about humanity become increasingly important, and biological anthropology is the field of study that tackles them. […]

Image of Copmuter Code on Screen
Science

Computer Programming: Understanding Variables

The leap from traditional calculators to the power of computer programming begins when we turn to variables, operations with variables, and input/output commands. When we combine variables with other operations or input/output commands, we get statements that let the computer do virtually everything we regard as impressive. […]

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. […]

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