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A Ripple Effect: Speakers in Session 12 of TED2013

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Session12_ARippleEffectTED2013 has come to an end. Here, the final session — about the doers and givers who never stop spreading their ideas. In session 12, these speakers shared their bold words and even bolder actions. And it all built to a riveting finale.

Here, the speakers who appeared in this session. Click on their name for a recap of their talk:

Sometimes controversial, always practical ethicist Peter Singer stirs public debate about morality, from animal welfare to global poverty.

Orly Wahba helps spark acts of kindness with viral cards (pass ’em around!) and her memorable short film, “Kindness Boomerang.”

Everything the donating public has been taught about giving is upside down, says Dan Pallotta, and he aims to transform the way society thinks about charity and change.

Julia Sweeney is an actor and writer who does comedic solo shows that tackle deep issues: cancer, family, faith. Her next book is “If It’s Not One Thing, It’s Your Mother,” on parenting and being parented. She performs regularly with Jill Sobule, telling stories alongside Jill’s songs, in their “Jill & Julia Show.”

After creating and conducting a worldwide virtual choir on YouTube, Eric Whitacre is now touring with an astonishing live choir.