b'Emily Bazelon talks with author Meghan O\\u2019Rourke about germ theory, biomarkers, medical mysteries, long COVID and the quest to return to health as chronicled in her new book The Invisible Kingdom: Reimagining Chronic Illness.\\n\\xa0\\nTweet us your questions @SlateGabfest or email us at gabfest@slate.com. (Messages could be quoted by name unless the writer stipulates otherwise.)\\n\\nPodcast production by Jocelyn Frank.\\nLearn more about your ad choices. Visit megaphone.fm/adchoices'