translation.en: Entering Europe around 35,000 years ago, and finally, a small group migrating up through the worst weather imaginable, Siberia, inside the Arctic Circle, during the last ice age -- temperature was at -70, -80, even -100, perhaps -- migrating into the Americas, ultimately reaching that final frontier.
translation.zh: 人类在三万五千年前进入欧洲， 最后，一小部分跨越最严酷的气候， 来到了西伯利亚， 进入北极圈，还是在最后的冰河时期。 这时候气温是大约负七十华氏，或者负八十，甚至负一百。 他们到了美洲，基本上是最后的前沿。