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Can you replace the question mark with a number?

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

Correct answers: 176

The first user who solved this task is Nílton Corrêa de Sousa.

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Brian Regan: One Eye Set Higher

My eye doctor told me this, Im not making this up. He goes, You know you have one eye set a little bit higher than your other eye? No, I didnt know that. He goes, Its no big deal; it doesnt affect your vision or anything. I just thought you might want to be self-conscious for the rest of your life.

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Galvani's electric fluid

In 1780, Luigi Galvani recorded, "The electric fluid should be considered a means to the nervo-muscular force." He reached this conclusion from work in his laboratory in Bologna, Italy, after a series of experiments and his accidental discovery that muscles are operated by electrical stimulation of nerves. He worked diligently along these lines, but waited for eleven years before he published the results and an ingenious and simple theory. His theory was that of a nervous electric fluid, secreted by the brain, conducted by the nerves, and stored in the muscles. Though his ideas were abandoned by scientists on account of later discoveries, his work opened the way to new research in the physiology of muscle and nerve and pioneered the subject of electrophysiology.

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