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Frustrated by the lack of academic challenge at Medford High School, 9-year-old Sheldon Cooper expresses his boredom to his family. He reveals that he has been in correspondence with Dr. John Sturgis , a professor at a nearby university. Dr. Sturgis invites Sheldon to audit his college physics course on , specifically focusing on gluons —subatomic particles that bind quarks together. young sheldon s01e19 720p webrip