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One of the strangest results in mathematics explains how it’s possible to turn one sphere into two identical copies, simply by rearranging its pieces.

New south walesUniversity of illinoisUnited statesDavid hilbertAlfred tarskiDima sinapovaGeorg cantorFelix hausdorffSpencer ungerNorman wildbergerStefan banachUniversity of torontoUniversity of new south wales