More evidence of Iranian nuclear weapons

Thousands of centrifuges not enough?  Go here for apparent evidence of the assistance of a (lone?) Russian scientist in the design of Iranian nuclear weapons.  The article mentions that the document in question "is described by officials familiar with it as a detailed narrative of experiments aimed at creating a perfectly timed implosion of nuclear material."

Implosion? Sounds like a plutonium device.

As you (my students) remember, the Arak reactor is ideal for the production of plutonium.  This article, for instance, delves into the potential of this reactor.