Listen as Jacqueline Novogratz discusses investing in sustainable small business solutions for the world's poor. The goal, says Novogratz, CEO of Acumen Fund, is to find a way to bring essential services to low income people not just...

Population scientist Lori Hunter talks about some of the broad impacts of the HIV epidemic in South Africa, including a possibly unsustainable reliance on local resources.

Much attention has been paid to 3D Printing lately, with new companies developing cheaper and more efficient consumer models that have wowed the tech community. They herald 3D Printing as a revolutionary and disruptive technology, but...

The video lesson from Khan Academy provides information for a high school world history course. This lesson provides an overview of the human, territorial, commercial and political impact of the Crusades. This is the third video segment...

The video lesson from Khan Academy provides information for a high school world history course. This section provides an overview of the changing relationship between the Roman Empire and Christianity from the time of Jesus to the reign...

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section gives an overview of innovations and causes of prosperity and stability during the Song Dynasty...

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section provides a discussion of how the relative influence of Confucianism, Taoism and Buddhism has...

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section provides an overview of the Ottoman, Safavid and Mughal Empires, along with their Turko-Mongol...

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the Timurid Empire that was established after the Black Death ravaged the Ilkhanate.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the reasons for the effectiveness of the Mongol Empire.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the impact of Genghis Khan and the Mongol Empire.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the spread of the Islamic culture after the death of Muhammad.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section provides the contextualization of the development of Islam.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the the Hijra to Medina and the conversion of Mecca during the beginnings of Islam.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section provides biographical information about the life of Muhammad.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the peasant revolts that occurred during the European Middle Ages' feudalism.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the feudal system of the Middle Ages.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section provides an overview of the Middle Ages.

The video lesson from Khan Academy provides practice questions for a high school world history course. This section discusses the process of trade during the early medieval years.

This video lesson from Khan Academy provides information about the Inca Empire. This information is intended for high students who are studying world history or the arts and humanities.

This video lesson from Khan Academy provides information about the Aztec Empire. This information is intended for high school world history students for for those who are studying arts and humanities.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section provides an overview of classical Japan. Chinese influence merges with Japanese culture.

The video lesson from Khan Academy provides information for a high school world history course. This lesson provides an overview of the Knights Templar and their role as international banking pioneers during the Crusades.

The video lesson from Khan Academy is intended for students who are taking a high school or college level world history course. This section discusses the schism that occurred to create two types of Islam. This is the second segment of...