by Mark O. Mar­tin — When I re­cently at­tended the Sixth In­ter­na­tional Sym­bio­sis So­ci­ety Con­gress in Madi­son, Wis­con­sin, I was awed by the fas­ci­nat­ing forms that sym­bi­otic re­la­tion­ships take among di­verse or­gan­isms. One talk that par­tic­u­larly in­trigued me was from the lab­o­ra­tory of Mar­i­lyn Rooss­inck of the...