Sorry, but I could not find back the article.
Instinctively, though, I would say that we do not share common ancestors. However, it would be nice and cosy to feel we are the same big family.
It seems to me if we have the same ancestors, we would speak the same language, assuming that language is the thing that differentiates us from animals. It is understandable that humans living in different areas have different face/body characteristics, we eat different foods, but why different languages?
Do white and black bears speak different languages too? Do monkeys living in India speak differently from those in China? Is there scientific evidence that the bears and monkeys have the same ancestors? How about the different kinds of fish? Do whales and tunas have the same ancestors?
If we have the same ancestors, which place on the Earth would they originate from? How did they manage to go to places it would take us a whole day by plane nowadays to reach? How did they know there was something on the other side? How were they so courageous even to make the trip "abroad", with all those big animals around?
Are the peoples that we are nowadays of different ages, by that I mean, are African people considered an "older" race than European people, for example? Or are we all the "same age"?
I can go on and on forever, but I will stop here, for now.