As glaciers expanded and contracted over Europe and Asia during the ice ages, the populations of Homo heidelbergensis that had migrated out of Africa developed new technologies. One of them, fire, changed the way they lived, ate, and spent time together. They built temporary dwellings and hunted large animals with wooden spears. And, during glacial periods, they retreated into refuges as smaller groups. Over time, this isolation led to increasing anatomical diversity. Populations of Homo heidelbergensis started to look different from one another and a new kind of robust human species appeared
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