Ohh also i saw the dispute between Genghis Khan being Turkic or Mongol... well i have some opinions:
First of all, even if we claim that history is a positive science we can never accept the preciseness of it. Because we get different information from many different sources, in which the best thing to do is to combine all those sources. Such as, a historian(European) says that in the battle of Nigbolu there were 120,000 Turks against 80,000 Crusaders... while a Turkish historian says there were 100,000 Turks and 200,000 Crusaders... so in these situations we have to believe both.(the real numbers were 110,000 Turks & 140,000 Crusaders as accepted by many sources if you were curious )
One such topic is the root of Genghis Khan... There have been many stupid suggestions(such as him being French). As general evidence we accept him as Mongol for he started as leading the Mongols, a great analysis with direct thinking, yet there are many evindences of a probable Turkic root...:
1-) He spoke Turkish as well as he could speak Mongolian. (we can't know which one was his primary language but we know he sent his international messages in Turkish.)
2-) On many places he introduced himself as a Turk, yet he also introduced himself as the Khan of the Nomads on many occasions... He may have called himself "Turk" because the Arabs called all the nomads Turks.
3-) According to the Chinese, Genghis Khans' roots go back to the Sha-To, who are, also according to the Chinese, descents from GokTurks.
4-) Based on descriptions, physically he didn't look Mongol. He had brown hair and colored eyes, just as the GokTurk Khans.
5-) According to legend, Genghis Khans blood traces to the wolf. At the time the Mongols considered the dog sacred, while the Turks had even made banners of wolves...
6-) ''Uturk al-Turka ma tarakkum" which means "Do not mess with the Turks as long as they don't mess with you", the words of Prophet Mohammad, mentioned during a meeting between Vahideddin Fuanci, a Muslim alim, and Genghis Khan when he asked him "He sounds like a wise, foreseeing man. Did he say anything about me?" and on the reply "He spoke true, it doesn't do good to mess with us"
7-) An Arab told Ogedei Khan one day, that he saw his father(Genghis Khan) in his dream, and he spoke to him. On this the Khan asked "What language did he speak?" , the Arab guy told him it was Arabic and the Khan's reply was "My dad only knew Turkish and Mongol".
8-) Most of his army was made of Turks.
Sources
1)Secret History of Mongols
2)Cengiz Han'n tm dnyaya ele geirmek istemesindeki amac kendine gre dnyay adaletle ynetmesi idi/Moollarn Gizli Tarihi, eviren Ahmet Temir, Ankara 1948.
3)Trk Islamic Encyclopedia
4)ingiz Han, muhtemelen, yalnz Mool ana dilini deil, ayn zamanda Trkeyi de biliyordu., halefleri ise daha baka lisan bilmekle beraber Moolcay da iyice bilmekte idiler.
(Bertold Spuler,Persian Mongols, S.491) Tr. vers.
5)A.Yu.Yakubovskiy
6)ingiz Han ordusu askerlerinden birou Trktler. bn-al-Asir yardan daha fazlasnn Trk olduunu syler. Nitekim ingiz Han ordusu Semerkand fethettikten sonra, Hvarizm-ahn Trk mdafilerini, fatihlerle ayn rka mensup olduklar iin korumu olmalar buna bir misal tekil eder.
(Bertold Spuler, Persian Mongols, S.495) Tr. Vers.
7)A.Yu.Yakubovskiy, (Golden Horde and It's Fall, S.61-62) Turkish.
NOTE: This had been roughly translated from http://lostlibrary.org