Duration: 47:21 Minutes
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The two-year-old girls from Vancouver, Canada, have confounded doctors and specialists alike.
Their mother believes when one watches television, the other can see the images even if her eyes are closed. The pair are linked at the thalamus, the control centre for sight, smell and touch, and experts believe Krista and Tati can share thoughts.
This remarkable film explores the girls’ lives for a year as they learn to talk and become aware of one another.