Gene Siskel and Roger Ebert are arguably the most influential American film critics of the 20th Century. Clips from their movie review TV show continue to circulate on social media and Youtube to the delight of new viewers and old fans alike. In his book OPPOSABLE THUMBS, film writer Matt Singer looks at the history of these film critics, the TV show opportunity that brought them together and brought them fame, and their lingering fingerprints on the media landscape. Skylight's Tyler Austin talks to him about the book, about Siskel and Ebert's relationship, and about the team's advocacy for cinema.