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Tunnel |
| Source: History Channel |
| Here are the stories of the world's great tunnels, of the genius of men and the marvels of machinery. From Brunel and Greathead, who developed an innovative shield which allowed them to burrow under the Thames, to Clifford Holland, who overcame nature and technology to carve his 8,463 foot path below the Hudson, few of the great architects lived to see their dreams completed. Perishing in greater numbers were 'sandhogs,' workers who labored beneath unforgiving waters to forge these indispensable subterranean arteries. See why that danger remains today with a look at the construction of New York's new water tunnel, inching forward even as the death toll climbs. |
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The History Channel
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Related Stuff |
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Science
| Muse |
| Cobblestone |
| Includes science articles. |
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| Mystery Tree Challenge |
| National Arbor Day Organization |
| Engage your students in learning the basics of tree identification with this fun hands-on activity. Materials are included in a PDF file. |
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| Studying the Sun |
| Texas State Energy Conservation Office |
| Free lesson plan in adobe format for 4th grade. |
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| Tree Diversity Activity |
| National Arbor Day |
| In this activity you will have an opportunity to design a community forest and discover the importance of tree diversity. |
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Technology
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