Warning! Spoilers ahead for Young Sheldon season 5.
Young Sheldon inadvertently retcons a detail related to Howard Wolowitz (Simon Helberg) in The Big Bang Theory. Sheldon's (Jim Parsons) engineer/astronaut friend was the latest character from the original sitcom to appear in the prequel spin-off. His guesting resulted in Sheldon explaining why he hates engineering so much. But not long after this revelation, Young Sheldon poses another question regarding Sheldon's relationship with Howard.
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