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The Great Man theory is a 19th-century idea according to which history can be largely explained by the impact of "great men", or heroes: highly influential individuals who, due to either their personal charisma, intelligence, wisdom, or political skill utilized their power in a way that had a decisive historical impact.
sources
1-http://novinparmis.com/ShowMaghaleC.aspx?id=2013827142411
2-http://www.biographyonline.net/people/men-who-changed-world.html
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http://www.fda.gov/ucm/groups/fdagov-public/documents/image/ucm113539.jpg
Genetic engineering is a targeted and powerful method of introducing desirable traits into animals using recombinant DNA (rDNA) technology. DNA is the chemical inside the nucleus of a cell that carries the genetic instructions for making living organisms.