SubjectsWorld History Ancient Aliens: The Demise of Neanderthals (Season 11) | History February 15, 2019 Facebook Twitter Google+ Linkedin RELATED ARTICLESMORE FROM AUTHOR Deficit and debt ceiling | American civics | US government and civics | Khan Academy US History Overview 2 – Reconstruction to the Great Depression Appomattox Court House and Lincoln's Assassination The yield curve | Stocks and bonds | Finance & Capital Markets | Khan Academy Pangaea | Earth geological and climatic history | Cosmology & Astronomy | Khan Academy