http://www.ted.com Professor Stephen Hawking asks some big questions about our universe — How did the universe begin? How did life begin? Are we alone? — and discusses how we might go about answering them.

TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes. TED stands for Technology, Entertainment, Design, and TEDTalks cover these topics as well as science, business, development and the arts. Closed captions and translated subtitles in a variety of languages are now available on TED.com, at http://www.ted.com/translate.

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http://www.ted.com What would a music video look like if it were purely directed by the music? Not driven by a concept, nor by a desire to build an image, but purely as an expression of a great song? Designer Jakob Trollback shares the results of his experiment in the form. The song is “Moonlight in Glory,” from David Byrne and Brian Eno’s classic album My Life in the Bush of Ghosts, remastered in 2006.

http://www.ted.com Filmmaker David Hoffman shares footage from his feature-length documentary Sputnik Mania, which shows how the Soviet Union’s launch of Sputnik in 1957 led to both the space race and the arms race — and jump-started science and math education around the world.

http://www.ted.com Leonardo Da Vinci’s life and work is well known — but his own face is not. Illustrator and activist Siegfried Woldhek used some thoughtful image-analysis techniques to find what he believes is the true face of Leonardo. Here, he walks viewers through exactly how he did it.