When my physics teacher lent me <i>Euclid rules, OK?</i>(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 <i>Understanding Comics</i> (Amazon: <a href="http://www.amazon.com/Understanding-Comics-Invisible-Scott-McCloud/dp/006097625X/" rel="nofollow">http://www.amazon.com/Understanding-Comics-Invisible-Scott-M...</a>; TED: <a href="http://www.ted.com/index.php/talks/scott_mccloud_on_comics.html" rel="nofollow">http://www.ted.com/index.php/talks/scott_mccloud_on_comics.h...</a>).<p>Which are your favourite non-fiction comics?<p>(1) <i>Euclid rules, OK?</i> is now titled <i>Here's Looking at Euclid</i> and can be downloaded from the linked page.