Good evening virtual audience and welcome. Thank you so much for joining us tonight. My name is kate and on the behalf of bookstore for Harvard University division of science in the Science Library i am so pleased to introduce this event with mario livio, presenting his latest book in one. Tonights event is an installment in our harvard scientists book series and we are so excited to continue to work and bring the authors of recently published science related literature to our communities during these unprecedented times. Just like always you can find announcements about Upcoming Events in the series at harvard. Com events science. You can also sign up for newsletter harvard. Com for more updates. Traditionally we have a Science Research Public Lecture series where you can see previous talks that you might have missed in the series. This seasons event will conclude with your questions but if you like to ask, please go to the ask the question button at the bottom of the screen where you