Embodied changeArchaeologists have known for some time that we once braved colder temperatures than anyone previously imagined. Human resilience to extreme temperature is baked into our bodies, behavior, and genetic code. “Our bodies are constantly in communication with the environment,” says Cara Ocobock, an anthropologist at the University of Notre Dame who studies how we expend energy in extreme conditions. But the relationship between bodies and temperature is surprisingly still a mystery to scientists. All four are biological anthropologists who have also puzzled over whether the rules Bergmann, Allen, and Thomson proposed are actually true.