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By searching for evidence that still survives today, we reconstruct the landscape and the wildlife of prehistoric North America. During the last Ice Age, massive glaciers covered half of North America. But to the far northwest, there was a land that
探索与发现2012年
The Yukon and its neighbor, modern-day Alaska, were once part of the land that was Beringia. Stunning though this region is today is just a shadow of the world that was encountered by the First Americans. Underground, the soil is frozen solid, as it
探索与发现2012年
This is Alaska today, a wetland of forests, boggy tundra, lakes and rivers rivers that still churn out fresh clues to the Ice Age past. This is a brick-sized tooth, and it belong to a woolly mammoth. Its narrow ridges of enamel tell us more about how
探索与发现2012年
They huddle and turn to face the threat, a giant short-faced bear. Faced by a wall of horns, the bear moves on to sniff out a less daunting meal. Occasional blizzards are another harsh reality of living in Beringia, but the drifting snow may at least
探索与发现2012年
One giant short-faced bear is more than a match for two lions. But in this bitter climate, lions cant afford to go without a meal for long. A mammoth calf in its first winter is a tempting sight. But mammoths are attentive mothers and they have the b
探索与发现2012年
Christmas loves a franchiseor any already beloved thing.It can dress up in tinsel and wrap itself around like mistletoe. And then, every year, there are the Christmas specials for almost every sitcom and cartoon, which nod in sincerity (or in irony)
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