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MATH PUZZLE: Can you replace...

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

Correct answers: 479

The first user who solved this task is Tarek Ibrahim.

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Adam and Eve had it good

Q. Why were Adam and Eve the happiest couple that's ever lived?

A. Because they didn't have in-laws!

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First skyscraper

In 1884, construction began in Chicago, Illinois, on the first skyscraper, the ten-story steel-skeleton Home Insurance Company of New York (The use of a steel skeleton made the building of skyscrapers possible, for the frame carries the entire weight of the building, instead of the walls themselves supporting the entire weight.) Designed by Major William Le Baron Jenney, marble was used on the walls of the building, with four columns of polished granite supporting a a marble balcony. Work was finished in the fall of 1885. Later, two more stories were added.

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