LIVE Solar eclipse Q&BA hangout
This is the recording of the live video chat hangout I did during the May 20, 2012 solar eclipse. We had a live video feed from a telescope, and several astronomers on hand to discuss it. Due to a few issues, it doesn't really start until 17:23 in, so start there!
Washington College of Law 2012 Commencement Address
American University Washington College of Law 2012 Commencement Address by Valerie Jarrett, Senior Advisor to President Barack Obama.
Butterflies of the British Isles
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Virtual Maths - Numbers, Geometry 3D shapes
Diagrams and forumulas for calculating area and volume of 3D shapes cube, cuboid, cylinder, sphere, hemisphere, triangular prism, frustrum, cone, pyramid
Joshua Goodman on the Challenges Facing American Schools || American Conversation Essentials
Harvard Kennedy School assistant professor Joshua Goodman outlines the challenges facing American schools, and compares them to more successful school systems in other countries.