The Cosmological Constant

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Martin Rees asks: Is this our final century?

Brian Cox on CERN's supercollider

George Whitesides: Toward a science of simplicity | Video on TED

E.O. Wilson on saving life on Earth

Rachel Pike: The science behind a climate headline | Video on TE

James Balog: Time-lapse proof of extreme ice loss | Video on TED

Michael Specter: The danger of science denial

Jor-El: Last-ditch appeal to save the planet

Richard Dawkins: Growing up in the universe

David Deutsch on our place in the cosmos

George Smoot on the design of the universe

Richard Dawkins on our "queer" universe

David Deutsch: A new way to explain explanation | Video on TED.c

Garik Israelian: How spectroscopy could reveal alien life | Vide

Stephen Hawking asks big questions about the universe | Video on

Andrea Ghez: The hunt for a supermassive black hole | Video on T

Patricia Burchat sheds light on dark matter

Carter Emmart demos a 3D atlas of the universe | Video on TED.co

Zach Kaplan and Keith Schacht demo toys from the future | Video

Tom Wujec demos the 13th-century astrolabe

Garrett Lisi on his theory of everything

Nick Sears demos the Orb

Marcus du Sautoy: Symmetry, reality's riddle

Margaret Wertheim on the beautiful math of coral | Video on TED.

Brian Cox: What went wrong at the LHC

Robert Lang folds way-new origami

Stephen Wolfram: Computing a theory of everything | Video on TED

Bruno Bowden folds while Rufus Cappadocia plays | Video on TED.c

Benoit Mandelbrot: Fractals and the art of roughness

Ron Eglash on African fractals

Brian Greene on string theory

Charles Fleischer insists: All things are Moleeds | Video on TED

Richard Feynman: Physics is fun to imagine

Philip Zimbardo prescribes a healthy take on time | Video on TED

Daniel Kahneman: The riddle of experience vs. memory

Sean Carroll on the arrow of time (Part 1)

Stewart Brand on the Long Now

Sean Carroll on the arrow of time (Part 2)

Eric Giler demos wireless electricity

Bill Gates on energy: Innovating to zero!

Steven Cowley: Fusion is energy's future

Brian Cox: Why we need the explorers