Mel Giedroyc, renowned for her role in The Great British Bake Off, explores the engineering wonders behind London's subterranean transport systems. Deborah Meaden, a savvy entrepreneur, delves into the emotional complexities of animal grief, examining whether our pets really experience sadness. Comedian Nish Kumar queries climate scientist Ed Hawkins about the looming climate crisis, seeking hope amid doom. Together, the trio navigates the delightful intersections of science and everyday life, sparking curiosity and laughter.