Stephanie D. Preston is professor of psychology and director of the Ecological Neuroscience Lab at the University of Michigan. She is coeditor of The Interdisciplinary Science of Consumption and author of The Altruistic Urge.
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Ordinary people can perform acts of astonishing selflessness, sometimes even putting their lives on the line. A pregnant woman saw a dorsal fin and blood in the water-and dove right in to pull her wounded husband to safety. Remarkably, some even leap into... SEE MORE