https://www.awesomestories.com/asset/view/Manchu-Qing-Dynasty-China-s-Last-Emperors

https://www.biography.com/people/francisco-pizarro-9442295

https://www.biography.com/people/christopher-columbus-9254209/videos/christopher-columbus-full-episode-2073085807

https://inventors.about.com/od/gstartinventors/a/Galileo_Galilei.htm