Laura Helmuth, the editor-in-chief of Scientific American, joins Lawrence O’Donnell to discuss the magazine’s historic endorsement of Joe Biden because of Donald Trump’s “incompetence on science.” Aired on 09/15/2020. » Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc About The Last Word with Lawrence O'Donnell: Drawing upon his experience as a former chief of staff on the Senate Finance Committee and as an Emmy-winning executive producer and writer of ""The West Wing,"" Lawrence O'Donnell examines the compelling and impactful political stories of the day. O'Donnell convenes diverse panels of guests, including a variety of politicians and cultural voices, to offer unique viewpoints and perspective. In his signature style, O'Donnell highlights the latest news developments and offers his take on the political stories driving the national conversation. MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, Meet the Press Daily, The Beat with Ari Melber, Deadline: White House with Nicolle Wallace, Hardball, All In, Last Word, 11th Hour, and more. Connect with MSNBC Online Visit msnbc.com: http://on.msnbc.com/Readmsnbc Subscribe to MSNBC Newsletter: http://MSNBC.com/NewslettersYouTube Find MSNBC on Facebook: http://on.msnbc.com/Likemsnbc Follow MSNBC on Twitter: http://on.msnbc.com/Followmsnbc Follow MSNBC on Instagram: http://on.msnbc.com/Instamsnbc Scientific American Backs Biden With Its First Presidential Endorsement In History | MSNBC