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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Daniel and Kelly shine a light on the inner workings of one of the crucial parts of the scientific process: peer review. How does it work? Who are these peers? Can peer-reviewed papers be wrong, and does that mean that all of science is questionable?

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Daniel and Kelly explore how scientific discoveries are made, digging into fun stories, the history of science with Prof. Lydia Patton and the lessons of Nobel Prize winners with Prof. Brian Keating.

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