good evening everybody my name is rose I'm with the Academy of Science st. Louis and we are one of the sponsors of tonight's talk along with the st. Louis Zoo and we're very pleased to be partnering with the zoo to bring you tonight science seminar before we get started this evening I'd like to tell you a little bit about the Academy of Science and who we are we're an independent science organization we're supported entirely through community contributions and we've been around for a very long time since 1856 it's our