This post was written by educator Michael Cruse. Sometimes, evening professional development is a hard sell after a day of teaching, especially on a night with single-digit temperatures here in Washington, D.C. The lure of the humid tropics and desert Southwest were enough to convince me, though. Photograph by Mike Cruse I wasn’t bound for parts south of the polar vortex, but instead to D.C. Teachers Night at the U.S. Botanic Garden. Sitting at the base of Capitol Hill, the Botanic…