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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Daniel and Kelly answer questions about gravtational slingshots, megafauna and microscopic black holes!

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Daniel and Kelly talk to Phil Halper about the many mysteries of the origins of the Universe.

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Daniel and Kelly dig into the mysteries of magnetism, explaining how magnets work and what they reveal about the Universe.

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Daniel and Kelly talk to Sean Carroll about where some of the basic assumptions we make about the Universe come from, and whether we need them.

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Daniel and Kelly talk about the science behind the "zombie ants".

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