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"The Effect of High Energy Muons
on Proton Pion Scattering
The Big Bang Theory Season 12, Episode 9

Did you ever watch
Professor Proton
The Big Bang Theory Season 7, Episode 22

Here he comes, Professor Proton
The Big Bang Theory Season 6, Episode 22

Hey, Professor Proton.
The Big Bang Theory Season 11, Episode 15

They cast the new
Professor Proton.
The Big Bang Theory Season 11, Episode 15