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MATH PUZZLE: Can you replace...

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

Correct answers: 277

The first user who solved this task is Donya Sayah30.

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Play chess with bald men

'I like to play chess with bald men in the park, although it's hard to find 32 of them.'

Emo Phillips (February 7 1956-)

Picture: Matthew Simmons/Getty Images

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Heart Surgery

In 1963, the first implantation of an intrathoracic left artificial ventricle in a human being was made by Dr. E. Stanley Crawford, at the Baylor University College of Medicine, Methodist Hospital, Houston Tx. USA. The original prototype is kept and exhibited at the Smithsonian Institution, Washington, DC. Within a few years, on 4 Apr 1969, the first total artificial heart was implanted, used as a bridge to heart transplantation by Dr. Denton A. Cooley, at the Texas Heart Institute, Houston Tx. USA.

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