116: You think you know when you learn, are more sure when you can write, even more when you can teach, but certain when you can program.
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About Alan Perlis
Alan Perlis was a 20th-century American computer scientist. Alan Jay Perlis was an American computer scientist and professor at Purdue University, Carnegie Mellon University and Yale University. He is best known for his pioneering work in programming languages and in 1966 he became the first recipient of the ACM Turing Award. Read more on Wikipedia →