Only on the "CBS This Morning" podcast, Oscar-winning filmmaker Sam Mendes and actor George MacKay join CBS News' Jamie Wax to discuss "1917," a World War I thriller that recently earned three Golden Globe nominations. Mendes shares how the film was partially inspired by his war-hero grandfather and how some of the conflicts surrounding World War I are present in the world again today. He also explains why the film was staged and edited to appear as if the events of the story were filmed in real time.  MacKay discusses why he wanted to perform his own stunts and why the story resonates with audiences.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.