i am barbara stover chief of community programs here at the museum. it is my pleasure to welcome you to an evening with david grinspoon. here at the national museum of natural history through research, exhibitions, programs and online resources we help promote the natural world and our place in it. we aim to inspire dialogue around the important scientific issues of our time. tonight's program is one of our after hours offerings. we include film screenings, lectures, conversations like tonight. and game nights. and our evening with a series of features leading researchers and thinkers and conversation with the museum director and paleontologist kirk johnson many of you have joined us in his engaging conversations between kirk and speakers or guests like evolutionary biologist wasn't, journalist eddie young, science exchange director and merchant, philanthropist david rubenstein and most recently, president of the university of maryland baltimore college, freeman -. this spring will feature florence williams as she explores the science of awe -- i woul