From M. Daughton
MDAUGHTON@derwent.co.uk
In the article, “Blessed is the weak”
(11 October, p 28), there appears to be
a mistake in one of the illustrations. The Feynman diagram 1b is supposed to
represent the collision of two photons to produce an electron-positron pair. It
actually appears to represent the collision between an electron and a photon
with the subsequent re-emission of the photon.
