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Replace the question mark with a number

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

Correct answers: 157

The first user who solved this task is H Tav.

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A Jewish Mother After Hanukkah

A man received two sweaters for Hanukkah from his mother. The next time he visited her, he made sure to wear one of the two sweaters.
As he entered her home, instead of the expected smile, she said, "What's the matter? You didn't like the other one?"

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J. Georg Bednorz

Born 16 May 1950.Johannes Georg Bednorz is a German physicist who shared the 1987 Nobel Prize for Physics (with Karl Alex Müller) for their joint discovery of superconductivity in a new class of materials at temperatures higher than had previously been thought attainable. They startled the world by reporting superconductivity in a layered, ceramic material at a then record-high temperature of 33 kelvin (that is 33 degrees above absolute zero, or roughly -460 degrees Fahrenheit). Their discovery set off an avalanche of research worldwide into related materials that yielded dozens of new superconductors, eventually reaching a transition temperature of 135 kelvin. Today, he develops complex oxide compounds with novel crystal structures for possible uses in microelectronics.

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