# Alfred Tarski

This is going to challenge your intuition. There is a theorem that claims that you can cut

a ball in finitely many pieces and glue them together to get two balls of the same size
as the first one. This is known as the Banach-Tarski Paradox, even though it is not a
paradox at all, but a counter-intuitive consequence of the Axiom of Choice (the movement
or gluing the pieces back together doesn’t change the shape of the pieces, but the pieces
are not “solid” in the usual way). Alfred Tarski, Polish mathematician and philosopher,
was born in January of 1902.

My friend Claudio Valdivia commented on the instagram post how to get an anagram of
Banach-Tarski: *Banach-Tarski Banach-Tarski.*