When the subject of the show is "modern marvels," you really don't know what to expect. Maybe this is a "potpourri" episode of the Mental Floss show Scatterbrained, where each host got to select a subject that fascinates them. Anyway, the new gives us information and trivia about skyscrapers, the history of robots, Tesla's Gigafactory, transportation myths, and the Three Gorges Dam.