by Elio — The wide-rang­ing sto­ries of how par­a­sites al­ter their host's be­hav­ior rank among the most fas­ci­nat­ing in all of bi­ol­ogy. I, for one, am en­thralled by the con­vo­lu­tions of these in­ter­ac­tions, all in­volv­ing a high level of com­mu­ni­ca­tion be­tween dis­parate or­gan­ism.