With regards to early studies of the geographic origins of mankind's relatives, it's important to know that Australopithecus was discovered two years after Roy Chapman Andrews went to Mongolia to try to find the earliest human ancestors. I know that Andrews never found early human ancestors in Mongolia and Australopithecus is three million years older than any of the early human beings discovered before Andrews' expedition to Mongolia, but Andrews and Osborn did not expect a human relative to be found in Africa. Would Andrews have considered the possibility of Africa being the cradle of mankind if he didn't find human ancestors in Africa? Did Osborn and Andrews ever change their mind about the geographic origin of mankind after hearing about the discovery of Paranthropus and other early human relatives in Africa in the 1930s?