All humans can trace their family tree back to a surprisingly small group of common ancestors. Every person on Earth’s most recent common ancestor might have died less than 2000 years ago.
When we get right down to it, we must face the truth that we’re all hopelessly inbred. It’s a question of basic mathematics – there simply aren’t enough ancestors to go around.
In fact, if you go back even further, we can trace a common ancestor with all other organisms on Earth.
RealLifeLore explains how we humans are literally one big family.