People in North America were voyaging by sea some 8,000 years ago, boosting a theory that some of the continent's first settlers arrived there by boat.
That is the claim of archaeologists who have found evidence of ancient seafaring along the Californian coast.
The traditional view holds that the first Americans were trekkers from Siberia who crossed a land bridge into Alaska during the last Ice Age.
The report in American Antiquity makes arrival by boat seem more plausible.
Confessional holds key to ancient Greek loot
GREEK archaeologists hope a priest who convinced a gold digger to give up ancient artifacts he unearthed by accident will let them know where the treasures came from, a representative said on February 19.
Georgia Karamitrou-Medesidi, director of a local archaeological commission in the Kozani prefecture in northern Greece said the man had gone digging for gold coins. "During confession, he told a priest what he dug up, and the priest convinced him to give him the artefacts to deliver to us. The priest is a deeply spiritual man and won't divulge the identity of the man," she told Reuters. "We just hope he can convince the finder to disclose the area he was digging in."