We investigate how closely related we all really are. Basic math tells us that all humans share ancestors. But you’ll be amazed at how recently those shared ancestors lived. Thanks to genetic data in the 21st century, we’re even discovering that we really are all descended from one mother. 

1. What does the video say about all humans having the same ancestors?

2. If we all came from the same ancestors, how come we are all different?

3. What is mitochondria? Where does it come from?