Letter: Letters: A load of balls?

From JOHN BISHOP

John Gribbin states that according to the Banach-Tarski theorems: ‘a
solid sphere with unit radius can be cut into five pieces in such a way
that two of the pieces can be reassembled into one solid sphere with unit
radius, while the other three pieces are reassembled into a second solid
sphere with unit radius’.

May I use this opportunity to advertise for a research assistant with
practical experience of the Banach-Tarski theorems to assist us in our research
programme on spheres of gold? (Applicants of proven ability may fix their
own salary.)

John Bishop University of Sheffield

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We will be publishing a full explanation of the Banach-Tarski theorems
in the near future – Ed