for our speakers at any time during the talk tonight. click on the q&a button at the bottom of the screen and we ll get through as many as time allows. this event also has auto-generated closed captioning available depending on the version of zoom you re using you may need to enable captions yourself by clicking on the closed caption button on your screen. you can disable the captions there as well. in the chat. i ll be posting a link to purchase not exactly lying on harvard.com your purchases truly make events like tonight s possible and help ensure the future of a landmark independent bookstore. thank you all for tuning in and purchasing books from harvard bookstore. we sincerely appreciate your support now and always and finally as you have no doubt experienced in virtual gatherings technical issues may arise if they do we ll do our best to resolve them as quickly as possible. thank you for your patience and understanding and now i m delighted to introduce tonight s speake