Daniel and Kelly talk to Jonathan Oppenheim about his unusual theory of unpredictable gravity

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Daniel and Kelly talk to Thomas Van Riet about how string theory unravels the puzzle of quantum gravity and whether math can be beautiful.

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Daniel and Kelly answer listener questions about soil on Mars, the double slit experiment, and adaptations for surviving on the Red Planet. 

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Can humans safely have babies in space? Daniel and Kelly talk about what we know about human health in space, and our prospects for starting families there. 

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Daniel and Kelly talk to authors about the science and storytelling of time-travel.

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Daniel and Katie answer a question about building super duper long structures in space

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Daniel and Kelly talk to Dr. Jonathan McDowell about the kinds of junk you find in space, the problems it causes, and what we can do about it. 

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Daniel and Kelly talk to Kathy Joseph about the true, twisted history of humanity's understanding of electromagnetism

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Daniel and Kelly talk about how santa takes solves an NP-hard problem, how reindeer fly and glow, and the physics of lamps that defy time.

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Daniel and Kelly answer questions from curious listeners, about big black holes, nuking hurricanes and the philosophy of photons.

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