"One beauty about humans, and animals in general, is we learn developmentally, " Schaal says.

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Stefan Schaal, a professor of neuroscience and biomedical engineering at the University of Southern California, stresses the importance of life experience in learning.

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Rhys Derby brings It's Rhys Derby Time to the festival, while Kristen Schaal's award-nominated 2008 show with Kurt Braunohler, Double Down Hearts, also features in the programme.

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The day, organized by UNESCO and the Fondation Air France, started with a debate moderated by French journalist and writer Florence Schaal, which pieced together a global view of street children and also touched on the right to education, legal implications and partnerships for action.

UNESCO: WORLDWIDE