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What is the missing number?

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 295

The first user who solved this task is Djordje Timotijevic.

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Cats

I've never understood why women love cats. Cats are independent, they don't listen, they don't come in when you call, they like to stay out all night, and when they're home they like to be left alone and sleep.
In other words, every quality that women hate in a man, they love in a cat.

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Wood pulp paper

In 1854, pioneering samples of basswood pulp paper made by John Beardsley were reported in the New York Daily Times which reprinted an article from the Democrat newspaper of Buffalo, New York. The article described three varied samples of the new paper that were shown to the editor of the Buffalo newspaper. Basswood is a tree of the linden family. Paper-making materials then in use included grasses, rag and flax. To transform wood into pulp, the cellulose fibres must be separated. Beardsley used a mechanical means of revolving cutters. A later history of paper-making book stated that his results were not successful. Earlier patents had been issued to other inventors for the processing of wood pulp for paper.«

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