Collection of scientific comic books by Jean-Pierre Petit

When my physics teacher lent me Euclid rules, OK?(1) I was struck by how effectively and engagingly comics could explain concepts and help build mental models. Scott McCloud analyses the medium superbly in Understanding Comics (Amazon: http://www.amazon.com/Understanding-Comics-Invisible-Scott-M...; TED: http://www.ted.com/index.php/talks/scott_mccloud_on_comics.h...).

Which are your favourite non-fiction comics?

(1) Euclid rules, OK? is now titled Here's Looking at Euclid and can be downloaded from the linked page.