fivethirtyeight.com/features/can-you-do-math-with-shapes

I've spent quite a deal of time on the second problem there.

I'm really close to a classification for finitely sized numbers, but I'm far from having all the rationals, farther from the algebraics and hopeless in terms of the reals.

I'm ignoring all the rules about rounding, because they seemed boring.

It seems that almost all real numbers have an average of 5.5.

so apparently theres a star spinning at about 716rps

namely PSR_J1748-2446ad