Science Friday Tangling With Entanglement And Other Big Ideas In Physics
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Dec 26, 2025 
In this conversation, Sean Carroll, a theoretical physicist and author, dives deep into the mysteries of our universe. He discusses black holes, revealing recent observational progress, including the Event Horizon Telescope. The nature of time is explored, along with the complexities of Schrödinger's Cat and quantum entanglement, which, surprisingly, can't transmit information faster than light. Carroll also sheds light on dark matter and the universe's expansion, leaving listeners pondering the biggest questions in modern physics.
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Make Advanced Physics Accessible
- Sean Carroll believes modern physics can be accessible to non-specialists with some math and clear teaching.
- He positions his books to sit between baby primers and full textbooks to fill a missing educational space.
Time Is Multiple Things
- Time has multiple meanings: what clocks measure and a coordinate label to find events in spacetime.
- Relativity separates personal experienced time from the coordinate time used to locate events, and entropy explains the arrow of time.
Schrödinger's Cat Thought Experiment
- Schrödinger imagined a cat in a box linked to a radioactive source to illustrate quantum superposition.
- He used the scenario to mock the idea that a cat could lack a definite alive-or-dead fact until measured.