This year marks the 100th anniversary of Albert Einstein's epoch-making invention of general relativity. This theory superseded Isaac Newton's Law of Universal Gravitation, which reigned as a fundamental law of nature for some 250 years. The first nontrivial solution of the Einstein field equations were derived soon afterward by Karl Schwarzschild. This note focuses mainly on Schwarzschild's solution, and its totally unexpected consequences, including black holes and (possibly) parallel universes.

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Correcting attachments to remove inadvertent duplication.

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