Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Margaret Gould Stewart, YouTube's head of user experience, talks about how the ubiquitous video site works with copyright holders and creators to foster (at the best of times) a creative ecosystem where everybody wins.

Margaret Gould Stewart manages the User Experience Team for YouTube, recently overseeing the redesign of the YouTube player page. She came to YouTube after two years leading Search and Consumer Products UX at Google. Stewart has been a practitioner and manager in the field of user experience for over 10 years.

After graduating from New York University's Interactive Telecommunications Program in 1995, Margaret consulted with  media companies such as the New York Times, Time-Warner and Scholastic to develop many of their first forays into the web.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Copyright law's grip on film, music and software barely touches the fashion industry ... and fashion benefits in both innovation and sales, says Johanna Blakley. At TEDxUSC 2010, she talks about what all creative industries can learn from fashion's free culture.

As the Deputy Director of the Norman Lear Center (a media-focused think tank at the University of Southern California) Johanna Blakley spends much of her time exploring how our entertainment interacts with our political, commercial and social habits.

She is especially interested in the surprising impact of intellectual property rights on innovation, organizing conferences around the lack of creative ownership in fashion as well as technology and the ownership of creative content.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Think of penguins as ocean sentinels, says Dee Boersma -- they're on the frontlines of sea change. Sharing stories of penguin life and culture, she suggests that we start listening to what penguins are telling us.

Dee Boersma considers penguins ocean sentinels, helping us understand the effects of pollution, overfishing and climate change on the marine environment.

To Dee Boersma, penguins are more than charming birds in tuxes. Highly sensitive to variations in the ocean, penguins are sentinels, sounding the alarm on environmental threats to marine ecosystems. As director of the the Wildlife Conservation Society's Penguin Project, she has dedicated almost three decades to tracking them in the South Atlantic. Using "nametags" -- numbered metal bands -- Boersma and her team follow hundreds of individual penguins to learn where they go, what they eat and how they survive to the next breeding season.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Despite her best efforts, comedian Julia Sweeney is forced to tell a little white lie when her 8-year-old begins learning about frog reproduction -- and starts to ask some very smart questions.

As a solo performer, comic actor Julia Sweeney explores love, cancer, family and faith. Her latest solo show and CD, Letting Go of God,  is about the "quest for something I could really believe in" -- which turns out to be no God at all.

Known for her four-year run on Saturday Night Live and her powerful solo shows, Julia Sweeney is carving out her own territory in entertainment, one that moves between the personal and the political, the controversial and the comical. Her most recent piece, Letting Go of God, traces a spiritual journey that takes an unexpected turn toward science (a turn that, incidentally, also led her to TED) and ends with atheism.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Alleviating poverty is more guesswork than science, and lack of data on aid's impact raises questions about how to provide it. But Clark Medal-winner Esther Duflo says it's possible to know which development efforts help and which hurt -- by testing solutions with randomized trials.

Esther Duflo takes economics out of the lab and into the field to discover the causes of poverty and means to eradicate it.

2009 MacArthur fellow Esther Duflo is pushing the field of development economics by studying specific causal relationships  that lead to or perpetuate poverty. She looks at close-to-home issues: household behavior, education, access to finance and health.