About half a million years ago, human beings learned to make fire. By collecting and burning wood they were able to warm themselves, cook food and manufacture primitive implements. All these activities utilize various forms of energy - biological, chemical, solar and hydraulic.
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http://www.wonderwhizkids.com/index.php/nuclear-power
read more.....
http://www.wonderwhizkids.com/index.php/nuclear-power
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