Archaeological, dietary, and social evidence point to “continuous fire-use” at least 1.5 Mya. Fire, fueled with wood and charcoal, allowed early humans to cook their food to extend its digestibility, improving its nutrient value and broadening the variety of foods that might be eaten. The cooking speculation proposes that the flexibility to prepare dinner promoted an increase in hominid brain measurement, though some researchers find the proof inconclusive. Archaeological evidence of hearths was dated to 790 kya; researchers imagine that is likely to have intensified human socialization and will have contributed to the emergence of language.
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