Stephen Hawking isnt the only high profile science nerd whos guested on the show (as before, were using high profile to mean high profile within the field of science, and not Dancing With The Stars high profile). Brian Greene, the theoretical physicist and string theorist (a discipline that Sheldon followed in his own research until recently) appears in The Herb Garden Germination as himself, discussing the contents of his most recent book. Neil Degrasse Tyson and George Smoot, both highly respected astrophysicists, appear in The Apology Insufficiency and The Terminator Decoupling, respectively. Smoot in particular, a Nobel laureate, contacted the show asking to cameo at some point. Finally, Ira Flatow, a radio and television journalist and author specialising in science, interviews Sheldon on his research in season threes The Vengeance Formulation, while Steve Wozniak, the inventor and engineer who helped Steve Jobs found Apple, appeared in season fours The Cruciferous Vegetable Amplification. Funnily enough, Wozniak actually was on Dancing With The Stars.
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