来自MSN1 个月
Ancient 'land bridge' that connected Siberia to US wasn't what it seems, scientists find
The land bridge, now submerged under the Bering Strait between Alaska and Russia, was above water from about 36,000 years ago to 11,000 years ago. Scientists thought it might have looked a lot ...
CBC.ca7 年
From dire wolves to giant bears: Meet the North American animals of the ice age
Graham Duggan Most archeologists agree that human beings reached North America 14,000 years ago, crossing a land bridge that existed between eastern Russia and modern-day Alaska. However ...