Terry Moore: Why is 'x' the unknown?

Daphne Koller is enticing top universities to put their most intriguing courses online for free -- not just as a service, but as a way to research how people learn. Each keystroke, comprehension quiz, peer-to-peer forum discussion and self-graded assignment builds an unprecedented pool of data on how knowledge is…

Salman Khan talks about how and why he created the remarkable Khan Academy, a carefully structured series of educational videos offering complete curricula in math and, now, other subjects. He shows the power of interactive exercises — and calls for teachers to consider flipping the traditional classroom script — give…

In Rajasthan, India, an extraordinary school teaches rural women and men -- many of them illiterate -- to become solar engineers, artisans, dentists and doctors in their own villages. It's called the Barefoot College, and its founder, Bunker Roy, explains how it works.

Every act of communication is, in some way, an act of translation. Onstage at TEDxRainier, writer Chris Bliss thinks hard about the way that great comedy can translate deep truths for a mass audience.

Combining dry wit with artistic depth, Billy Collins shares a project in which several of his poems were turned into delightful animated films in a collaboration with Sundance Channel. Five of them are included in this wonderfully entertaining and moving talk -- and don't miss the hilarious final poem!