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Prof Proton Stays For Tea + Has penny got any single grandmas (TBBT 7x07 The Proton Displacement) - YouTube
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The Big Bang Theory on Twitter: "🎶Grab your goggles, put your lab coat on, here he comes, Professor Proton!🎶 Don't miss an all-new #BigBangTheory tomorrow night at 8/7c! https://t.co/rwkQ31VLaU" / Twitter
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Big Bang Theory: What happened to Professor Proton? Why did he leave? | TV & Radio | Showbiz & TV | Express.co.uk
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