Lidia Bastianich visits men and women serving on the front lines. From coast to coast, she follows police officers, firefighters, paramedics, military and medical workers, and observes the role food plays in these first responders' lives.

Moving you from learning about Zen meditation to actually trying it, Professor Davis walks you through setting up an optimal time and place for your practice, determining which positions work best for you. He provides an in-depth explanation of the best ways to properly breathe and how to focus on your breathing, in order to calm the "monkey mind."

Continue to build on your knowledge of multivariable differentiation with gradient vectors and use them to determine directional derivatives. Discover a unique property of the gradient vector and its relationships with level curves and surfaces that will make it indispensable in evaluating relationships between surfaces in upcoming episodes.

What is biodiversity? This exciting and colorful video explores the concept of biodiversity as it applies to a wide range of environments. The importance of biodiversity on Earth is also discussed.

In the High Middle Ages, new commerce and trade networks transformed societies and cultures. See how medieval commercial towns arose across Western Europe in order to satisfy the desire for trade. Survey the long-distance trading zones that fed the wealth of these cities. Within Africa, assess the trade-rich Mali Empire, the fabled city of Timbuktu, and the wealthy trade of the Swahili Coast.

In the last half-century, suicide rates have increased nearly 60% worldwide. This is your opportunity to investigate ways to think about this stigmatized subject. You'll examine what great philosophers and holy books say about suicide, and consider the numerous factors that sometimes compel people to take their own lives.

Within the grammar of conversation, study the distinction between involved discourse, which relates to negotiating relationships, and informational discourse, which involves delivering information. Then grasp the important roles of discourse markers, small words such as "so," "well," and "oh," that help organize discourse and manage our expectations in conversation.

Conclude your lesson on adventure photography by applying the skills you've acquired to the broader world. See what works and what doesn't as you explore how to craft a great "scene setter," zoom in or out for maximum impact, and shoot images of the night sky. Also, learn the importance of good lighting and doing your research.

Learn how the pulse or beat of a piece of music is organized in the written score, within small segments called measures, with the meter signature indicating how the beats are grouped within the measure. Observe how written musical notes have a rhythmic value, indicating how long each note lasts in time. Practice clapping musical rhythms, to understand how a piece of music moves through time.

Meet Ashoka the Great, whose story was all but forgotten until his carved edicts were unearthed in the 19th century. As leader of India, he leads a bloody charge into the neighboring province of Kalinga-but guilt from the battle drives him toward a transformative conversion. For the rest of his reign, he serves as a paragon of Buddhist morality.