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Kunal Nayyar (b. 1981) is an actor best known for playing Rajesh Koothrappali on The Big Bang Theory. His other credits include voice work in animated features (such as Ice Age: Continental Drift and Trolls) and an uncredited appearance on NCIS.
He presents the word "Robot" with Grover and Memorybot as The Word of the Day in Sesame Street Season 44.