The Great Courses (Firm)

Discover why thinking like an economist can give you newfound confidence in a range of financial and personal situations. Learn how to identify the varied situations in which economics affects your life-and how to wield the tools economists use to help you make the wisest choices in those situations.

This lecture covers the wealth of knowledge about the Moon, a heavily cratered world with extensive lava-filled basins on the Earth-facing side and yet few such features on the far side-which is not perpetually dark.

Few terrestrial organisms can be as comfortable in the water as insects. Look at the unique respiratory physiology and fascinating adaptations that make it possible for them to maintain oxygenation underwater, as well as the adaptations that allow water striders to take advantage of water's surface tension to skim along its surface.

In 1978, a developer chose to build a hotel in Kansas City using a management technique called fast-tracking, in which construction begins before the design is complete. What can happen when each principal assumes that someone else has designed a critical structural connection? Explore the series of mistakes that led to the tragic collapse of two suspended walkways and the deaths of 114 people.

Unpack the term "Crusade" and situate it in its cultural context. When Pope Urban said it was the Christians' duty to take up arms against the "infidels," ordinary people were swept up in the idea that they were fighting to save Christianity and their own souls against the advance of Islam.

One of the most epic engineering failures in history was the collapse of the Tacoma Narrows Bridge in 1940. Nicknamed "Galloping Gertie," the bridge undulated so strongly that thrill-seekers came from all over just to drive across it. Explore the inherent structural inefficiency of the suspension bridge, and why this bridge failed spectacularly only four months after its opening.

Before it was settled, around 65% of Iceland had vegetation. Now, only 0.5% of the country is forested. So, what happened to the forests? Get a closer look at the dangers of steep-slope erosion, as well as some of the natural difficulties currently challenging Iceland's century-long effort to reforest the country.

You know that if you don't maintain your car, it can stop working. But we have often overlooked that lesson when it comes to bridges. Follow the fascinating case of the Mianus River Bridge and discover how lack of maintenance caused its collapse in 1983, although the bridge had just been inspected. What happened to those pin-and-hanger connections? And exactly, whose fault was it?

The truth is, our planet belongs to the insects. In 24 captivating lectures beautifully illustrated with graphics, photos, and video footage, Professor Scott Solomon shares his passion for these extraordinary creatures. Why Insects Matter: Earth's Most Essential Species will open your eyes to evolutionary accomplishments you had never even imagined.

The central regions of many galaxies go through an active, very luminous phase early in their development. The most powerful of these active galaxies, called quasars, shine like beacons across billions of light years of space.