Daniel and Kelly talk about the development of the polio vaccine.

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Daniel and Kelly answer questions from listeners about aliens, archaea and the speed of light.

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Daniel and Kelly get concrete about whether physics is the map or the territory, the topic of Daniel's new book "Do Aliens Speak Physics?"

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Daniel and Kelly talk to Ethan Siegal about whether we should expect physics to be explained by a single unified theory.

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Daniel and Kelly talk about how aliens might experience the Universe and how it might shape their science, a topic from Daniel's new book "Do Aliens Speak Physics?"

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Daniel and Kelly get answers to listener questions about why we age from Dr. Venki Ramakrishnan, author of "Why We Die: The New Science of Aging and the Quest for Immortality".

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Daniel and Kelly talk about how gravity, magnetism and relativity work together to create one of the most brilliant spectacles in the Universe.

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Daniel and Kelly talk to Phil Metzger about the engineering challenges of building self-replication space probes.

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