A guinea pig does its part for science and human relations by sitting on the lap of an autistic child. Erin Burnett/Courtesy of Maggie O'Haire hide caption

itoggle caption Erin Burnett/Courtesy of Maggie O'Haire

Seeds of fear? To most of us, cantaloupe and horn melon look like a healthy breakfast or snack. But the clusters of seeds can evoke anxiety, nervousness and even nausea for some trypophobes. Daniel M. N. Turner/NPR hide caption

itoggle caption Daniel M. N. Turner/NPR

Elyn Saks, mental health law scholar, speaking at the TEDGlobal conference. James Duncan Davidson/James Duncan Davidson hide caption

itoggle caption James Duncan Davidson/James Duncan Davidson