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MATH PUZZLE: Can you replace...

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

Correct answers: 356

The first user who solved this task is Pratima Singh.

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Uber is in trouble because it...

Uber is in trouble because it doesn't pay any taxi.

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Spring tape measure

In 1868, Alvin J. Fellows of New Haven, Connecticut recieved the first U.S. patent for a spring tape measure. The tape measure was enclosed in a circular case with a spring click lock to hold the tape at any desired point. (No. 79,965). Earlier, a machine to print ribbon for the supple sewing tape measures had already been patented on 3 Sep 1847, after four years of research by the French fashion designer, Lavigne. Further, however, Sheffield, England claims to be not just the home of stainless steel, but also where the spring tape measure was invented.

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