I had the pleasure of speaking at a symposium on the role of phenotypic plasticity in evolution at the Evolution 2018 in Montpellier France recently. My talk on the role of maladaptive plasticity in adaptation to high-altitude can be viewed below. It features new unpublished work from an experiment using 6 species of Peromyscus as well data from my recent papers in Evolution and Integrative and Comparative Biology.