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http://www.thebookseller.com/news/goblinproofing-ones-chicken-coop-wins-diagram-prize.html

His hugely successful strategies included intelligence gathering, understanding his rivals' motivations, being quick to learn and adopt new technologies and ideas, and successful people management. Genghis Khan is one of history's most charismatic and dynamic leaders - and you will need all his skill, strength and tenacity to succeed in both dentistry and business.

When Temujin was about 20, he was captured in a raid by former family allies, the Taichi'uts, and temporarily enslaved. He escaped with the help of a sympathetic captor and joined his brothers and several other clansmen to form a fighting unit. Temujin began his slow ascent to power by building a large army of more than 20,000 men. He set out to destroy traditional divisions among the various tribes and unite the Mongols under his rule. Through a combination of outstanding military tactics and merciless brutality, Temujin avenged his father's murder by decimating the Tatar army and ordered the killing of every Tatar male less than 3 feet tall. Temujin's Mongols then defeated, the Taichi'ut, using a series of massive cavalry attacks, and had all the Taichi'ut chiefs boiled alive.
...
The Mongols swept through every city's fortifications with unstoppable savagery. Those who weren't immediately slaughtered were driven in front of the Mongol army, serving as human shields when the Mongols took the next city. No living thing was spared, including small domestic animals and livestock. Skulls of men, women, and children were piled in large, pyramidal mounds.