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  That's not a fair example, I know what linear algebra is but can't tell what's going on. Change of basis would be my guess, but that's pretty _basic_. You could've provided something far worse, like a manual construction of the Jordan normal form of a large matrix.

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  Makes sense though. The complex Riemann-Zeta function (Zeta(x) = sum from 1 to infinity of 1/n^x) only converges for Re(x) > 1, else it is infinite. We can use analytic continuation - which I understand as extending the function such that it remains holomorphic (basically continuous but in the complex numbers and for some reason well-defined) and find the value of Zeta(-1) that way. The value of Zeta(-1) when viewed this way is -1/12. It's not really saying the sum of all natural numb...

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  There's enough people surgically implanting small magnets into their fingertips for a surprisingly detailed Wikipedia article to be a thing: https://en.wikipedia.org/wiki/Magnetic_implant Also some interesting, mostly¹ SFW but not for the faint of heart, images of the DIY surgery: ::: spoiler Images  (Note: the images are unrelated, this isn't a before and after) ![](https://upload.wik...