On an isolated group of tranquil Pacific Ocean islands, 1,000 kilometers from the nearest land, evolution takes its own course. Plants and animals adapt to the distinct surroundings and arrive at an ecological balance. But now, invasive species have arrived and threaten that delicate balance. In this episode we'll look at the unique wildlife of the Ogasawara Islands, the threats to that ecosystem and the steps being taken to prevent an environmental tragedy. We'll also get an inside look at a promising new approach to stomach cancer diagnoses that combines artificial intelligence with endoscopes.