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Iain Armitage stars in “Young Sheldon”

• “Young Sheldon” closes its fourth season with a finale in which young Missy’s first heartbreak sparks a series of events affecting brother Sheldon and the entire Cooper household. There’s no real-world heartache for this show’s cast and creative team, though: CBS recently renewed “Young Sheldon” for three more seasons. (CTV & CBS 39 at 8)