First Americans may have been Alaska beachcombers

[Alaska Dispatch]  The massive glaciers of the last ice age retreated from an island off the Alaska Peninsula much earlier than once thought, suggesting that people could have been migrating along Alaska’s ice-free southern coast for millennia before any corridor opened over land. The findings — based partly on analysis of ancient pollen in lake sediments on Sanak Island — offers dramatic indirect support for a controversial theory that North America was settled by sea and not by land.