Isaac Asimov Helped Define The Big Bang Theory's Timeline In A Major Way

The Big Bang Theory prequel Young Sheldon mostly avoided defining its timeline, but sci-fi author Isaac Asimov put a major event on the board.
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Young Sheldon Easter Eggs: Every Big Bang Theory Cameo, Callback, And Future Reveal

TVLine is taking stock of the many nods, cameos and crossovers linking "Young Sheldon" to its predecessor, "The Big Bang Theory." First launched in September 2017, the long-running prequel filled in ...