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Replace the question mark with a number

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

Correct answers: 98

The first user who solved this task is Fazil Hashim.

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Pilot: Have you ever flown in ...

Pilot: Have you ever flown in a small plane before?

Passenger: No, I have not.

Pilot: Well, here is some chewing gum. It will help to keep your ears from popping.

Pilot (after the plane landed): Did the gum help?

Passenger: Yep. It worked fine. The only trouble is I cant get the gum out of my ears.

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Mary Whiton Calkins

Born 30 Mar 1863; died 26 Feb 1930 at age 66.American educator and psychologist who was the first american woman to attain distinction in these fields of study. Calkins studied psychology at Harvard as a “guest,” since women could not officially register. After completing all requirements for a doctorate at Harvard, and with the strong support of William James and her other professors, Harvard still refused to grant a degree to a woman. She established the first psychology laboratory at a women's college (Wellesley). She developed the paired-associate procedure for studying verbal memories. One of her main findings was that repeated pairings of words increased memory. Calkins was interested in a wide variety of research topics, including perception, personality, emotion, and dreaming.

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