British scientists have created what they say is the world's most realistic human avatar. Combining facial modeling and mathematical algorithms, 'Zoe' has advanced language function and displays a range of emotions. The technology could act as an assistant to business executives or a teacher's aide, especially to hearing-impaired or autistic children. The team believes the smartphone-and tablet-friendly avatar may have cracked the "uncanny valley," the point at which human replicas come close to being realistic but still cause discomfort among people.

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