David Plotz talks with author Mat Johnson about his new novel Invisible Things. Johnson’s novel tells the story of a group of astronauts that land in a bubble colony on Jupiter's biggest moon. They talk about the challenges of writing satire when reality feels fake, how mediocre people rise up by sucking up, and why we need to look at the invisible things in our daily lives.   Tweet us your questions @SlateGabfest or email us at gabfest@slate.com. (Messages could be quoted by name unless the writer stipulates otherwise.) Podcast production by Cheyna Roth Learn more about your ad choices. Visit megaphone.fm/adchoices