# math; a weird phenomenon, the Banach-Tarski paradox, how to create two balls by reassembling one in 3-D space.

<< A famous geometrical theorem called the Banach-Tarski paradox says that if you have a ball in 3-D space and split it into a few specific pieces, there is a way to reassemble the parts so that you create two balls. (..) When the two new balls are created, they will both be the same size as the first ball. >>  Thomas Britz. 

Sherry Landow. The mystique of mathematics: 5 beautiful math phenomena. University of New South Wales. May 20, 2020.

https://phys.org/news/2020-05-mystique-mathematics-beautiful-math-phenomena.html    

Banach–Tarski paradox

https://en.m.wikipedia.org/wiki/Banach-Tarski_paradox