Sean Carroll is an outstanding science communicator. Not only is he very knowledgeable, but he also speaks very clearly and engagingly, and with very few pauses or hesitations. Here he begins a new series in which he talks informally about fundamental concepts.
Will Carroll ask or explain how the exclusively linear momentum of a BB expansion became the angular momentum of the galaxies?
He did not, but he said he will deal further with conservation of momentum in a future talk. He is an accomplished speaker.