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Replace the question mark with a number

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

Correct answers: 296

The first user who solved this task is Djordje Timotijevic.

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Loni Love: All the Holidays

I used to work in an office, and when I worked in an office, I celebrated all the holidays -- Cesar Chavez Day, Labor Day -- just to get a day off of work. It could be KKK Day -- Do I get a day off of work?

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Iron lung

In 1927, the first iron lung (electric respirator) was installed at Bellevue hospital in New York for the post war polio epidemic. The first iron lung was developed at Harvard University by Phillip Drinker and Louis Agassiz Shaw built with two vacuum cleaners. The iron lung is a negative pressure machine which surrounds the patient's body except for the head, and alternates a negative atmospheric pressure with the ambient one, resulting in rhythmic expansion of the chest cage (and thus inhalation) in response to the negative extra thoracic pressure. During periods of ambient extrathoracic pressure, the lungs deflate. This type of machine is rarely used today.[Image: Early Drinker respirator prototype, 1928]

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