But despite their name, the mighty Everglades did not exist during the ice age. So what did pre-historic Florida look like? There is one place in northern Florida that has revealed more ice age secrets than almost anywhere else, the dark slow-moving

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英语听力：探索发现 2013-01-13 冰河新新州 Ice Age Oasis—14

Some of this ice age dung was found beneath the skull in the Aucilla. The dung contained plant remains that tell us what the mastodon was browsing on 13,000 years ago or morea mixture of trees and grasses. This suggests that ice age Florida was drier

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英语听力：探索发现 2013-01-16 冰河新新州 Ice Age Oasis—15

Could it be that drastic water shortage was the reason for the mastodons' epic migrations? Another big piece of this puzzle lies far out to sea. This is the ocean floor. But this isn't rock sprouting out at the bottom. It's wood. It's the remains of

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英语听力：探索发现 2013-01-18 冰河新新州 Ice Age Oasis—16

This triggered other dramatic changes. As sea levels dropped, so did the inland water tables. Florida's fresh water drained away through the porous limestone rock. Pools dried up and springs diminished. Florida was on the brink of drought. And animal

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英语听力：探索发现 2013-01-20 冰河新新州 Ice Age Oasis—17

Today, there is a group of larger visitors here, too. A herd of mastodons led by the matriarch have just returned from their annual migration hundreds of miles to the north. Now the winter drought is over and the spring water has been topped up by re

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英语听力：探索发现 2013-01-23 冰河新新州 Ice Age Oasis—18

Meanwhile, the ground sloth, like the mastodons, must eat most of the day to fuel its huge bulk. This may be the ice age, but by midday, temperatures soar, drawing another predator to the spring to drinkthe notorious saber-toothed cat. Most creatures

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英语听力：2013-11-27 地平线：什么害死了我们的蜜蜂—3

-So you had a tough year.-We have got that, yeah. It's been an incredibly bad winter, and that's companed with probably the worst summer we ever have had as well, last year. -So these boxes should be out, full of bees working. -Yeah, they have been b

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英语听力：2013-11-29 地平线：什么害死了我们的蜜蜂—4

The thing is bees are very sensitive to the weather. If the temperature falls below fourteen degrees or if it rains they just won't leave the hive. The nectar of the flowers is also temperature dependent. So if it's cold, there will be less nectar an

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英语听力：2013-12-01 地平线：什么害死了我们的蜜蜂—5

-Do we have any fruits?-No fruits. There's no fruits available today. -Perhaps some tomatoes? -Tomatoes? No, no. Absolutely no tomatoes. It's fruit pollinated by bees. Like it, enjoy your meal? -No, it's little bit dry, though. -Bit bland. -OK. You m

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英语听力： 2013-12-04 地平线：什么害死了我们的蜜蜂—6

The first step is to try to really understand the enemy. Poor little bee. So Jean, where is it on this bee that? Ok. I think if you looked even with a naked eye. Just to the side of the abdomen. Yes, oh, on the belly there. That grape red colored. Ok

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探索发现：History Channel:西恩宾回顾滑铁卢战役-25

好莱坞演员西恩宾（Sean Bin）回顾了滑铁卢这一历史上最具决定性之战役的故事。在影片中，他将引述那些当时参战的普通士兵的实际经历来讲述发生在1815年6月18日这一天的极具戏剧性的事件

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探索发现：History Channel:西恩宾回顾滑铁卢战役-26

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探索发现：History Channel:西恩宾回顾滑铁卢战役-27

-French colonies are now reaching for the front line of the ally position, famous sunk lane, as you can see, just here. It was actually slightly deepen underneath those -...looks quiet. -It looks quuiet, but it's no quiet. There's a little bank just

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探索发现：History Channel:西恩宾回顾滑铁卢战役-24

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2015-02-25 BBC:星光七纪元-11

This whole process explains the distinctive shape of all solar systems including our own. The reason why you see all the planets going around the Sun in the same direction on the same plane is because they are all formed from the same belt, from the

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2015-02-20 BBC:星光七纪元-10

At this time people very much believed that God had created a template for the heavens and he'd used pretty much the same template to create the society as well, and so with this as above so below belief, any change in the heavens immediately had hug

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2015-02-13 BBC:星光七纪元-9

But when a star is born and starts its life story, scientists have discovered that something else very important can begin. The first person to get an inkling of the second story of creation was Nicolas C, the father of modern astronomy, an accidenta

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2015-01-30 BBC:星光七纪元-5

Many regions within these clouds can stay like that for ever for millions of years until something happens, a trigger and then a star forms.The trigger for such a monumental event doesn't have to be much, two clouds conbine as they pass, or a distant

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2015-01-28 BBC:星光七纪元-4

This cluster the Pleiades mentioned by Homer in the Odyssey, they appear in the Bible and in some of the goddess by the Aztecs and the Maya, but the interesting thing is that the Pleiades are so young, that early dinosaur never saw them, because at t

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2015-01-16 BBC:星光七纪元-1

Each night after the sunsets, sit back, look up and you can witness an epic drama playing above our heads. One involving a cast of billions, the stars. Every one with its own story to tell. There are old red giants, so puffed up. They are coming apar

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