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