00:00This is you, and these are your two parents.
00:03They each have two parents as well, who are your four grandparents, who each have two more parents.
00:11With every generation, the tree grows, meaning by the time you go back to the year 1400,
00:17You'll have over 16 million ancestors.
00:21And if you go back a few centuries more,
00:23Your family tree will include more humans than the population of Earth at that time.
00:30But that's because the further back you go, the less people there were on Earth.
00:34So the more likely it is your ancestors were already related,
00:38with distant cousins marrying each other.
00:40And that means one ancestor will show up more than once in different places on your family tree,
00:46Meaning it's not that big after all.
