Folks, it's hardly maths and it certainly isn't fun, I know; but ... I've come across a curious bug at http://en.wikipedia.org/wiki/Lagrange's_four-square_theorem in the section Proof using the Hurwitz integers where (under my browsers) one displayed formula terminates in the proud claim " (1/4)^2 + (1/2)^2 + (1/2)^2 + (1/2)^2 = 15/16 < 1 . " Why the fuss --- surely all I need to do is click the edit button to call up the source text, and correct the TeX. The latter certainly looks to be current --- it shows the same typo "consequense" (sic) on the following line --- but there the corresponding formula already reads correctly " ... =\frac{13}{16}<1. " Can somebody please check that this is not some individual glitch affecting only my ancient Mac? I have attempted to access the relevant bug search & report pages, but rapidly concluded that negotiating that particular jungle would prove a task for an explorer more heroically committed than myself ... It is a somewhat alarming prospect that numerical constants on Wikipedia pages may be subject to elementary errors which are impossible to correct! Fred Lunnon