Cattle expert Dr Temple Grandin has been named headline speaker at the annual Power of Possibilities event organised by Gateway, a US-based charity helping people with developmental disabilities.

Dr Grandin did not talk until she was three-and-a-half years old. At the time she was diagnosed with autism, her parents were told she should be institutionalized. Dr Grandin describes the early period of her life as "groping her way from the far side of darkness" in her first book, Emergence: Labeled Autistic.

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