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An icy barrier up to 300 stories high — taller than any building on Earth — may have prevented the first people from entering the New World over the land bridge that once connected Asia with the Americas, a new study has found.These findings suggest that the first people in the Americas instead arrived via boats along the Pacific coast, researchers said...Based on stone tools dating back as much as 13,400 years, archaeologists had long suggested that people from the prehistoric culture known as the Clovis were the first to migrate from Asia to the Americas. Prior work regarding the...

They're probably about half as old as scientists once thought they were. But a pair of butchered bones found in a cave near the Alaska-Yukon border are "definite" evidence of human presence in North America just after the end of the last Ice Age, perhaps as much as 14,000 years ago, according to a new study. The bones were originally discovered in the late 1970s by Canadian archaeologist Dr. Jacques Cinq-Mars at a site known as Bluefish Caves, high in northwestern Yukon Territory. In one of the caves, dubbed Cave 2, archaeologists found more than 18,000 fragments of bones from...