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...