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Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya). [1]The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
Michael Brown in a 1998 article identified this as evidence of a possible Caucasian founder population of early Americans spreading from the northeast coast. However, a 2008 article in the American Journal of Human Genetics by researchers in Brazil took up the argument against the Solutrean hypothesis. "Our results strongly support the ...
Hazard ratios do not reflect a time unit of the study. The difference between hazard-based and time-based measures is akin to the difference between the odds of winning a race and the margin of victory. [3] When a study reports one hazard ratio per time period, it is assumed that difference between groups was proportional.
A 2013 study in the journal Nature reported that DNA found in the 24,000-year-old remains of a young boy in Mal'ta Siberia suggest that up to one-third of the indigenous Americans may have ancestry that can be traced back to western Eurasians, who may have "had a more north-easterly distribution 24,000 years ago than commonly thought" [16 ...
Pieces of limestone from a cave in Mexico may be the oldest human tools ever found in the Americas, and suggest people first entered the continent up to 33,000 years ago – much earlier than ...
The quest to trace our first steps in America led one researcher to a groundbreaking discovery on a small island. A Scientist Says He Has Evidence That Ice-Age Humans Lived in Maryland 22,000 ...
The history of Native Americans in the United States began tens of thousands of years ago with the settlement of the Americas by the Paleo-Indians. The Eurasian migration to the Americas occurred over millennia via Beringia, a land bridge between Siberia and Alaska, as early humans spread southward and eastward, forming distinct cultures and ...
The oldest fossil evidence for paravians — the dinosaur group that includes the earliest birds and their closest relatives — appears around the middle of the Jurassic Period (201.3 million to ...