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The emotional core of the episode follows Sheldon as he faces a massive career crisis. After twenty years of dedicated research, he begins to fear that String Theory is a dead end that can never be proven.

Sheldon gets a haircut from Penny to signify his "new beginning". Watch www xrysoi se The Big Bang Theory S07E20 H

In his intoxicated state, he leaves a series of rambling, desperate voicemails for none other than Stephen Hawking , who eventually calls him a "jackass". The Rise of "Clogzilla" The emotional core of the episode follows Sheldon