Sal finds trigonometric identities for sine and cosine by considering angle rotations on the unit circle. [6:13]

Sal solves a problem by considering the periodicity of the tangent function. [4:01]

The Modern Revolution began about 200 ago and created the world we live in today. This video explains the key ingredients needed for the Modern Revolution. [2:37]

In this video, journalist and best selling author Cokie Roberts and Aspen Institute President and CEO Walter Isaacson discuss women and their role in the expansion of America. [5:33]

A video where Walter Alvarez introduces geology. Learn how the physical features of Earth can tell us about its history. [6:43]

A video about how new elements created new possibilities, which enabled conditions around stars that were just right for making planets.Learn more about the formation of Earth and the solar system. [12:05]

Sustainable energy is one of the greatest challenges for chemists today. This video discusses the research into possible solutions. [4:08]

World War I was one of the bloodiest events in human history. Primarily because industrialized weapons were used for the first time in a war context. This video discusses this and many other reasons that contributed to the high casualty...

Learn how Cyrus the Great overthrew the Medians to establish the Achaemenid Empire (Persian Empire). Follow the history of this empire in his video which includes a timeline. [13:53]

This video [2:00] provides an overview of what rigging is all about. It involves adding controls to a digital model to create animated characters.

This video [3:33] discusses the Flex Model of blended learning. Basically, it relies on online learning with offline tasks. Students move with flexibility through different learning modalities.

This video [0:48] poses the order for preparing for a blended learning environment: select the educational software, think about the hardware and infrastructure, and then the space to facilitate high quality blended learning.

This video [8:55] discusses the four types of educational software and the pros and cons of each. These include whole course software, supplemental software, teacher tools, and learning apps.

This video [2:28] discusses resources to help schools choose educational software that will meet the needs of their students. It includes reading user reviews and two new resources Common Sense Media and EdSurge.

This video [12:46] focuses on new ways to structure the school day and year in a blended learner environment to meet the needs of students and staff.

This video [10:09] focuses on new ways to group students and organize staff for a blended learning environment.

This video [15:53] focuses on the facilities and furniture to support your educational model: Four ideas on space: start with desired outcome; bigger, more flexible learning spaces inside leaner, greener schools; stuck in existing space,...

This video [1:11] focuses on four different blended learning models. It lists the three main models: Station Rotation, Lab Rotation, and Flex.

This video [2:38] discusses how you think about redesigning schools putting aside the ways schools normal assumptions.

This video [4:09] focuses on the assumptions that limit innovation in education: these include the school year, daily schedules, and class size. Rethinking how you use traditional one teacher and groups of students.

This video [14:57] discusses leading organizational change to transform existing schools or to launch new schools for blended learning. It is much more difficult to change an existing school than a new launch.

This video [15:30] focuses on the process of innovation, changing the ways school is done in a blended learning environment. Innovation approaches: build a solution to the problem by design thinking, lean startup methodology, and...

Find out how to calculate exactly how much oxygen is deep down inside your lungs! [7:5]

Find out how to calculate exactly how much oxygen is deep down inside your lungs! [7:59]