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I am weightless, but you can s...

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Correct answers: 70

The first user who solved this task is Jasmina Atarac.

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Tough Dog

He tells the clerk that he wants a dog.
The clerk asks, "What kind of demeanor do you want the dog to have?"
The man says, "I'm looking for a guard dog, demeanor the better!"

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Stephen Cole Kleene

Died 25 Jan 1994 at age 85 (born 5 Jan 1909).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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