Noether's Theorem: How Symmetry Produces Conservation Laws
PBS Space Time · Explainer · 13 min · 2018 · YouTube title: Noether's Theorem and The Symmetries of Reality
Why it's here
HN commenters point to it as an approachable explanation of how symmetries give rise to conservation laws, including the story of Emmy Noether.
What it covers
PBS Space Time explains Noether's theorem: conservation laws such as energy and momentum are consequences of deeper symmetries. It also covers why those laws hold only under certain conditions.