Eastern Africa hosts the longest record of human evolutionary and cultural change on the planet. Archaeological sites across what are today Kenya and Tanzania preserve evidence for the emergence of bipedal hominins, our ancestors’ earliest experiments with stone tools, technological and social innovations, and expansions of diverse forms of food production. Here, we present a synthesis of recent advances in geochemical methodologies, source identifications, and applied sourcing studies that have enhanced our understanding of human-obsidian relationships across the volcanic landscapes of Kenya and Tanzania over the last two million year

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