Roman Mars & Kurt Kohlstedt, Shayla Lawson, and Colin Hay

<p>Host Luke Burbank and announcer Elena Passarello discuss the mysteries they can never seem to solve; <em>99% Invisible</em> podcasters Roman Mars &amp; Kurt Kohlstedt unveil the hidden world of everyday design in their companion book <em>The 99% Invisible City</em>; writer Shayla Lawson takes the lead role in her new collection of essays <em>This Is Major</em>, in which she celebrates black womanhood; and Colin Hay, former frontman of Men at Work, performs an acoustic version of their hit song "Overkill."</p>