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MATH PUZZLE: Can you replace...

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

Correct answers: 129

The first user who solved this task is Thinh Ddh.

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Confucius Says...

Confucius says...
"Man who stands in front of car gets tired, man who stands behind car gets exhausted."

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3D X-rays

In 1966, the first X-ray three-dimensional stereo fluoroscopic system was installed for use in heart catherization by Richard J Kuhn. The $30,000 machine, developed by Joseph Quinn was put into use at the University of Oregon Medical Center, Portland, Oregon, U.S. The X-ray tube had one anode but two cathodes, an image intensifier with polarizers, and a synchronized analyzer. This produced a 3D image that could be seen through a viewing mirror without the use of special glasses.

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