4.7 Summary

Human activity has been responsible for some extinctions and othe deleterious changes to habitats. These changes have not always been the result of thoughtless or selfish behaviour; often intentions were worthy, but outcomes were not as predicted. The importance of genetic diversith is demonstrated here in relation to Dutch Elm disease. The need to retain genetic diversity in plants, used for food and medicine, is recognized in such initiatives as the Kew Milennium Seed Bank Appeal.


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Copyright © 2013 The Open University

3.3 Extending the distance scale
‘This is the way the world ends / Not with a bang but a whimper.’ (T.S. Eliot) But how about the way the world begins? Was this the biggest bang of all? This unit will introduce you to the theory of the Big Bang and will present the three main lines of experimental evidence that support this theory.
Author(s): The Open University

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Except for third party materials and otherwise stated (see http://www.open.ac.uk/conditions terms and conditions), this content is made available under a http://creativecommons.org/licenses/by-nc-sa/2

Eyewitness Accounts
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049 - BELLUM HELVETICUM - LOWE BUTLER WALKER
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005 BIBLIA SACRA CASTELLIONIS GENESIS
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US Marines Battle of Guadalcanal
Archival, newsreel-style documentary footage of the United States Marines’ participation in the Battle of Guadalcanal. It was fought between August 7, 1942, and February 7, 1943, in the Pacific theatre of World War II. This campaign, was fought on the sea, in the air and on the ground, pitted US Marines against Imperial Japanese forces and was a decisive, strategically significant campaign of World War II. (The term "Japs" may be offensive.)

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War of The Century - Part 17
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Korean History - Gojoseon, the First State of Korea
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Helsinki 1952: The Games of the XV Olympiad
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