We not only love trees for their beauty — we need them for our survival. But around the world, some trees, and even entire forests, are facing numerous existential threats. On this episode, we explore why we need trees, the dangers they face, and new efforts to help them survive and thrive.

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How does nature make durable materials like corals and seashells without a heat or a kiln? How do peacock feathers get their beautiful colors? Scientists are trying to understand these processes and to replicate them for sustainable human products and design. The field of biomimicry is growing. We'll explore its origins and hear about some of the latest innovations.

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Circadian rhythms affect more than our sleep — they can shape all aspects of our health, and are in turn shaped by the rhythms of our lives. We explore the intricate mechanics of our internal clocks, and how they affect our health.

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With a contested presidential election looming, we explore what's at stake for health and science, from fertility medicine to cyber security with voting machines, and efforts by scientists to protect themselves from political influence.

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It's that time of year when we celebrate something we usually hate: fear. We visit haunted houses and corn mazes or binge-watch the scariest horror movies. In its most primitive form, fear is about survival — so we can face or escape serious threats. In other settings — where there's no danger — fear can feel exhilarating or fun. On this episode, we explore our complicated relationship with fear.

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Your face flushes hot, maybe your fists clench, your heartbeat speeds up and your blood pressure rises. It's rage and it can go from zero to red-hot in seconds. It's normal to feel angry when you or somebody else has been wronged, mistreated, or hurt. But even justified rage can become destructive. How do we handle these fiery emotions when they erupt?

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Police generally aren't trained to deal with mental health crises — and yet they constantly find themselves called to intervene in these challenging situations, sometimes leading to disastrous results. On this episode, we explore efforts to change how law enforcement and health care work together.

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Every second counts when it comes to treating patients in cardiac arrest — which is why researchers and health care professionals are working constantly to find faster and better ways of delivering care. We hear about some of the latest advancements, from a new generation of networked AEDs to high- and low-tech innovations in treating heart disease.

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What's the best educational setting for my child to learn and grow? It's a question many parents contemplate, but it's an especially difficult question for parents of autistic kids. We explore the often unseen challenges these kids face at school, the battles parents face advocating for change, and what experts say could actually make a difference.

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We explore what it takes to recover from serious mental illness, with stories about how a patient's decades-long relationship with his psychiatrist helped him overcome severe depression, how a new crisis response program balances safety with providing help to those experiencing mental health emergencies, and how Patrick Kennedy went from politician to mental health advocate.

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