Brian Greene hosts this four-part NOVA series built on his own book, walking through the ideas that make space, time, and matter far stranger than they look. Episodes tackle whether space is an actual substance, why time seems to flow in one direction even though the underlying physics doesn't require it, and how quantum mechanics allows particles to affect each other instantly across any distance, a phenomenon Einstein himself distrusted. Greene uses street-level demonstrations, animated graphics, and interviews with working physicists to make abstractions like entanglement, the Big Bang's uniformity problem, and string theory's extra dimensions concrete. The final episode takes on the multiverse, laying out the case some cosmologists make for countless other universes branching off from our own. Greene stays the constant presence throughout, translating equations into scenes you can picture: a coffee cup's cooling as a clue to time's arrow, a light switch as a stand-in for the quantum world's refusal to behave like the one we see.