Hominids: humans and any of our bipedal ancestors. Ian mortimer says any time when the past is engaged. Prehistoric divided from historic - people open to historical analysis when written records. Prehistory through art: cave art, symbols, markings. Prehistory through modern people who didn"t evolve: san people of southern africa. Prehistory through writing: a historic record of prehistoric people, e. g. French jesuits writing about algonquian and iroquoian peoples in 17th century canada. Prehistory through physical remains: flint arrowheads, remains of people. Prehistory through genetics: genetic donation from people, looking at human remains compared to modern. Neolithic (new stone age): neolithic/agricultural revolution ~10,000 bce. About 10,000 years ago, human population of world about 6 million. About 5,000 years ago, about 50 million. By 2,000 years ago, about 250 millions. Farming and domestication of livestock led to astonishing growth. Also led to storage and pottery, clothing, etc. Didn"t happen everywhere, as some places simply can"t farm.