Genghis Khan conquered most places but even though Timur was born after him he had better techniques he conquered places Genghis Khan did NOT conquer. Therefore Genghis Khan had a wheel (I dont know how big) and killed every one taller or is in the height that reached the wheel but when he he enslaved he just used them as maids when he killed them, he either killed them by wrapping them to carpet and ran by horse or as in a casual way by sword. Timur was as merciful so he killed everyone except for women and baby's. When he enslaved them, he used them ( did not treat them as good as Genghis Khan, you get what I mean right? ). When he killed them he boiled them in a ginormous pot, he killed them casually and by horse alike Genghis Khan. Fun fact, he used the male slaves to build the places he is known built ( the one in Central Asia). while others were not so tough when it came to torturing but Europe was there for land mostly and gold as well as peoples languages and items. Americas did not kill as much as Timur and Genghis Khan but they enslaved more.
They went to school or college and they got a respectful career or job..... In the middle east they couldn't really improve any social and educational statue...