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Big Bang Theory plot hole: Sheldon quote creates error in Leonard's childhood | TV & Radio | Showbiz & TV | Express.co.uk
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Johnny Galecki Birthday Special: 11 Funniest Leonard Hofstadter Quotes From The Big Bang Theory You Should Revisit (LatestLY Exclusive) | 📺 LatestLY
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The Big Bang Theory on Twitter: "Does Penny not know Leonard's birthday? # BigBangTheory https://t.co/xUHsEQIPC3" / Twitter
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