How Are We All Related as Humans on Earth?

TL;DR

Every person on Earth is at least 50th cousins with everyone else, sharing common ancestors due to exponential growth in family trees. Our most recent common ancestor likely lived 2,000 to 4,000 years ago, highlighting our close genetic connection. Additionally, our bodies are composed of more bacteria than human cells, and every atom in our body is replaced roughly every five years.

Transcript

[Vsauce] Hey, Vsauce, Michael here, and you guys are my family. Scientifically speaking, geneticists tell us that every single person on earth is, at the least, 50th cousins with everybody else on earth. It kind of has to be that way. Think of it like this— you have two biological parents and four biological grandparents, and eight biological great... Read More

Key Insights

• 🧑 Every person on Earth is at least 50th cousins due to the exponential growth of biological ancestors.
• 🧑‍🤝‍🧑 Common family members can be found within 10 generations if dating or married to someone from the same country and ethnicity.
• 🫤 Our most recent common ancestor lived 2,000 to 4,000 years ago, indicating how closely connected we are as a species.
• ❓ Our bodies contain more bacteria than human cells, constantly renewing and replacing their composition.
• 🫀 Every atom in our body is replaced within a five-year period, emphasizing the constant change within our physical makeup.
• 🫀 Atoms are incredibly small, with a billion sodium atoms weighing only 38 femtograms.
• 🤩 Each human body contains more atoms than there are stars in the known universe.

Questions & Answers

Q: How closely related are people on Earth?

Every person is distantly related to each other, with a one in five chance of sharing a common family member fewer than 10 generations ago if they are from the same country and ethnicity.

Q: How recent is our most recent common ancestor?

Scientific models suggest that for every human alive today, our most recent common ancestor lived only 2,000 to 4,000 years ago, showcasing the interconnectedness of the human population.

Q: How many bacteria are in our bodies?

Our bodies contain more bacteria than human cells, with bacterial cells outnumbering human cells. Bacteria constantly die and are replaced, contributing significantly to our overall cellular makeup.

Q: How many atoms make up the human body?

Each individual cell in our body contains 100 times more atoms than there are stars in the Milky Way galaxy. Multiply that by the number of cells, and the human body contains more atoms than there are stars in the known universe.

Summary & Key Takeaways

• Every individual on Earth is distantly related to each other, with a one in five chance of sharing a common family member less than 10 generations ago if they are dating or married to someone of the same ethnicity.

• Our most recent common ancestor lived 2,000 to 4,000 years ago, indicating how closely connected we are as a human species.

• Our bodies contain more bacteria than human cells, constantly dying and being replaced, and every atom within our bodies is replaced every five years.