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Einstein's equations allow wormholes. They don't forbid them — they just require something we've never found: exotic matter with negative energy. Traversable wormholes live at the edge of what general relativity permits and what the universe seems willing to provide.

Black holes aren't just exotic objects — they're places where our best theories stop working. The singularity isn't just a dense point in space; it's a crack in the mathematical structure of reality.

Newton said gravity was a force. Einstein said gravity doesn't exist — only curved spacetime. General relativity isn't a correction to Newtonian mechanics; it's a completely different picture of reality.

Einstein started with one weird postulate: light travels at the same speed for everyone, regardless of how fast they're moving. Everything else — time dilation, length contraction, E=mc² — follows from that single, stubborn fact about the universe.

Space and time were separate in Newton's universe. Einstein fused them, made them dynamic, showed that matter curves them. Now we're asking whether they're fundamental at all — or emergent from something stranger. This series tracks that story.