Science Magazine Podcast Grappling with declining populations, and the future of quantum mechanics
Dec 4, 2025
Join Zack Savitsky, a contributing news correspondent for Science and a voice on quantum mechanics, as he explores the philosophical depths of quantum measurement problems. He dives into interpretations and thought experiments like Wigner's Friend, examining conflicting realities. Then, hear from Anne Goujon, a program director at the International Institute for Applied Systems Analysis, as she discusses global population trends. She highlights uncertainties post-peak population and advocates for adapting policies to support low-fertility societies and aging populations.
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Measurement Changes Quantum Behavior
- The double-slit experiment shows quantum objects behave as waves unless measured, then they behave like particles.
- Measurement appears to change the system, creating the core mystery of quantum mechanics.
Copenhagen Leaves Measurement Unspecified
- The Copenhagen interpretation accepts the measurement postulate but leaves 'measurement' undefined.
- That lack of mechanism frustrates physicists who want a deeper explanation.
Wigner's Friend Paradox
- Eugene Wigner's thought experiment imagines a sealed lab where a friend measures a quantum coin while Wigner stays outside.
- The friend sees a definite outcome while Wigner treats the whole lab as a superposition, creating a paradox.