Gav prepares for his orals

(Well, that's as best as I can describe it)

This supremely cool piece was drawn by Aric Campling, who draws Hosers. If I weren't so tickled by the look of evil in Gav's eyes... (EYES?!?) I might mention that U-235 is the fissionable bomb-making stuff and that U-238 is a neutron absorber which prevents said explosions... Good thing I won't mention that. :)

What's in the bag, Gav?: