Children under age 2 can reason abstractly, researchers say. Jandrie Lombard/iStock hide caption

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"I felt so lucky to be Catholic and I loved the Catholic school and I loved the nuns ... then when it came to the belief part of it I was always a little bit skeptical" — Julia Sweeney James Duncan Davidson/TED hide caption

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Rev. Billy Graham speaking at a TED conference in 1998. Courtesy of TED hide caption

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