Fertilizer… boring? Not on our watch! In this episode of Tiny Matters, we trace the history of fertilizer from the ‘Guano Wars’ to the invention of the Haber-Bosch process, one of the most impactful chemical breakthroughs in human history. Today, scientists and communities are rethinking how we handle nutrients, and asking: could our own urine help close the nutrient loop? We chat with chemist Leila Duman about why nitrogen is so hard to “fix,” how industrial fertilizer feeds billions (while unfortunately polluting waterways), and why the Haber-Bosch process is still essentially perfect. Then we head to Vermont’s Rich Earth Institute, where researchers are turning human urine into safe, effective fertilizer and reimagining waste as a resource.

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In this episode of Tiny Show and Tell Us, we explore a listener's experience with peanut allergy immunotherapy — what it is, how the therapy works, and the odd and fascinating history of allergy treatments, including a 19th‑century scientist who shoved grass pollen up his own nose. Then we chat about “reef balls” made of oyster shells and concrete. These mini artificial reefs are being used to restore marine habitats and, in some cases, also hold cremated remains.

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In this special crossover episode, Tiny Matters welcomes Alexis Pedrick, host of Distillations from the Science History Institute. You’ll hear the Distillations episode “The Mothers of Gynecology” — a powerful investigation into the racist origins of gynecology and the ongoing maternal health care crisis that disproportionately affects Black mothers. Through interviews with historians, clinicians, midwives, doulas, and public health researchers, the episode traces how racist myths about Black bodies — especially beliefs about pain tolerance — continue to shape medical care and outcomes. Following the episode, we unpack some of what you’ll hear, from the horrific exploitation of enslaved women by J. Marion Sims, to modern-day disparities that affect even the wealthiest, most famous Black mothers, including Beyoncé and Serena Williams.

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