The Secret Genius of Modern Life episode 10 - Microwave - Hannah Fry takes us on an enthralling expedition into the hidden past of microwave technology, tracing its roots to the clandestine radar systems developed during World War II. She uncovers how this technology, initially designed to detect enemy aircraft, serendipitously found its way into our kitchens, revolutionizing the way we heat simple foods like baked beans. In her quest, Hannah discovers the fascinating tale of an engineer's melted candy bar, inadvertently leading to a major breakthrough in cooking technology – the invention of the microwave oven.