About this episode

Philippa Gander discusses the science of internal clocks and the impact of modern technology on our biological rhythms.

All of life is profoundly shaped by the daily, monthly, and yearly cycles of our planet, and all creatures have internal timekeeping systems that rely on cues from the surrounding environment. With modern technology, we are changing our environments—and by proxy, the  ecosystems around us—to override these innate rhythms of life. But at what cost? Life in Sync:  The Science of Internal Clocks and How We're Disrupting Them (Princeton University Press, 2025) reveals how Earth’s rotations shape our biology, what human sleep cycles looked like before the advent of artificial light, and why technology can’t free us from the constraints of our circadian clocks. Philippa Gander explores the science behind the biological rhythms that animate us and our world, blending captivating storytelling with illuminating examples ranging from migratory birds and hibernating squirrels to jet-lagged pilots and astronauts in space. She shows how genetic circadian clocks are an ancient evolutionary adaptation that we share with all life on the planet, and how our rapidly expanding use of artificial light at night disrupts the time cues for entire ecosystems. Gander explains why cutting…

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