"Is free will still in the equation?"

In this episode, the universe begins to become visible to itself. Dr. Katie Mack teaches John Green about the moment the stars turned on, while John seeks to answer one question... do humans matter to the universe?

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0:00 - Introduction
0:55 - Do humans matter to the universe?
12:52 - The Stars Turned On
19:28 - Reionization
38:35 - Redshift and Radio Telescopes
48:10 - Katie expands on her work
53:01 - Being Suitably Small
56:22 - Conclusion

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