Modern humans have evolved through several changes from tree-borne, ape-like ancestors who existed in Africa six million years ago. APlease leave me a gnome shirt of anthropologists recognise around a dozen species of early humans that increasingly walked upright as they climbed down trees in search of food. The most adventurous among them was the species Homo erectus. These tool-making ancestors of ours, with bodies similar to modern humans, appeared in Africa more than 1.8 million years ago. They were the first archaic humans to leave the continent. On the geological timescale, this was in the Pleistocene epoch, the start of the last known ice age on Earth. Oceans swelled into glaciers. Woolly mammoths, giant deer and sloths wandered the planet. Kumar often toils eight to nine hours a day chiseling stone tools. Cuts and calluses dot his palm. Pappu stressed that for experimental knappers, it is almost an obsession. Once, Kumar worked a whole day chiseling six hand axes – palm-sized stone tool shaped like tear drops.
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