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I make two people out of one...

I make two people out of one. What am I?

Correct answers: 555

The first user who solved this task is Djordje Timotijevic.

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I had a joke about a...

“I had a joke about a cake, but it's stale.”

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Stephen Cole Kleene

Born 5 Jan 1909; died 25 Jan 1994 at age 85.American mathematician and logician whose research was on the theory of algorithms and recursive functions. He developed the field of recursion theory with Church, Gödel, Turing and others. He contributed to mathematical Intuitionism which had been founded by Brouwer. His work on recursion theory helped to provide the foundations of theoretical computer science. By providing methods of determining which problems are soluble, Kleene's work led to the study of which functions can be computed.

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