SamathaLarson.11845_a72e2cfc7a7acc4989f308f263f3ee12In her first story for Nautilus, Samantha Larson explains the science of dread and fear and desire. Then she describes exactly what those emotions feel like when they are induced by a high-stakes rock climbing challenge. Experience it vicariously for yourself and marvel at photos of Samantha on the edge of the world. @samantson and samanthalarson.comimage: Samantha Larson