by Connie Oswald Stofko You may have heard Amy Stewart speak last year during the National Garden Festival in Buffalo on her book, Wicked Plants: The Weed that Killed Lincoln’s Mother & Other Botanical Atrocities. If you did, you already know what an engaging speaker she is. If you missed her last year, hurry and register for her talk tomorrow on her newest book, Wicked Bugs: The Louse that Conquered Napoleon’s Army and other Diabolical Insects. The talk will take…