Earliest human migrations and expansions of archaic and modern humans across continents began 2 million years ago with the migration out of Africa of Homo erectus. This was followed by the migrations of other pre-modern humans including H. heidelbergensis, the likely ancestor of both modern humans and Neanderthals. Finally, Homo sapiens ventured out of Africa around 100,000 years ago, spread across Asia around 60,000 years ago and arrived on new continents and islands since then.
Knowledge of early human migrations, a major topic of archeology, has been achieved by the study of human fossils, occasionally by stone-age artifacts and more recently has been assisted by archaeogenetics. Cultural and ethnic migrations are estimated by combining archaeogenetics and comparative linguistics.
<span>Henry Ford perfected the assembly line.</span>
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The 442nd Regimental Combat Team was the most decorated unit for its size and length of service, in the entire history of the US Military. In total, about 18,000 men served, ultimately earning 9,486 Purple Hearts, 21 Medals of Honor and an unprecedented seven Presidential Unit Citations.
Oral traditions make it possible for a society to pass knowledge across genera-tions without writing. It also helps people make sense of the world and are used to teach children and adults about important aspects of their culture
