My guest on this week’s Book Club podcast is science writer Carl Zimmer, whose new book Air-Borne: The Hidden History of the Life We Breathe explores the invisible world of the aerobiome – the trillions of microbes and particles we inhale every day. He tells me how Louis Pasteur's glacier experiments kicked off a forgotten scientific journey; how Cold War fears turned airborne research into a bioweapons race; and why the COVID-19 pandemic exposed a century-long misunderstanding about how diseases spread through the air.

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