So, what ``degree'' of cousin are you to me?

Let's assume all humans on planet Earth at this moment has a pair of common ancestors, according to either some religious documents (e.g., Biblical Adam and Eve) or some molecular biology hypotheses (e.g., Y-chromosomal Adam and Mitochondrial Eve).

And, there are 6.5 billion people on planet Earth now.

Let's assume every couple in the history of mankind has \( e= \lim_{n \rightarrow \infty}{\left (1 + \frac{1}{n}\right)^n} \approx 2.718\) children that can reproduce grandchildren on average. (

*e*is the mathematical constant a.k.a. Euler's number that can magically describe many phenomena in our universe.)

Because the natural logarithm of 6.5 billion is around 23 (\(\ln(6.5\times 10^9) \approx 22.595\) ), everyone on planet Earth now is at least my 23-rd cousin.

Thanks for reading this blog post from your 23-rd cousin.

Dear NASA, please find my 100-th cousin on another planet and say hi to him/her for me.

(This blog post contains math formulas rendered by MathJax from LaTeX. )

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