yeah, but maybe you should. ♪ (laughter) ♪ ♪ >> jimmy: that's ann wilson sitting in with the cletonest, ann, really. you should come here every night, we would love to have you here doing that every night. >> thank you. [ cheers and applause ] >> jimmy: ann begins the second leg of her tour tomorrow night in indio, california. tonight, one of our very favorite guests, he is a school science teacher and exploder of things. "science bob" pflugfelder is here. [ cheers and applause ] then their new album comes out tomorrow it's called "one more light." linkin park from the mercedez-benz outdoor stage. you can see linkin park on tour starting july 27th in mansfield, massachussetts. both linkin park and ann wilson will be paying tribute to the great chris cornell tonight. [ cheers and applause ] next week, we have brand new shows with jim carrey, zac efron, jada pinkett-smith, rachel, "the bachelorette" connie nielsen will be here, jon bass, plus music from bush, zach brown band, lil yachty, and u2 will be here in celebration -- [ cheers and applause ] this is very, very exciting -- of the

wilson, journalist ed young, science exchange director ann merchant, philanthropist dade rubenstein -- david rubenstein and president of the university of maryland-baltimore college. our final evening program of this season will take place later this spring and will feature florence williams as she explores the science of awe and the important role that nature plays in our everyday or lives. at this point, i'd like to thank david rubenstein not only for participating in the series, but for making this series possible. thanks to his generous gift, we're able to host tonight's conversation and continue our public engagement programming. before we get started, i'd like to take a moment to encourage you to complete and turn in your surveys. we learn a lot from your input, and we use the information to develop our programming. so thank you in advance. also, please, remember to turn off cell phones. and now i'd like to introduce our featured gift, dr. david grinspoon. david's an honest-to-goodness astrobiologist, an award-winning science communicator and a prize-winning author. his latest b