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MATH PUZZLE: Can you replace...

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

Correct answers: 450

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

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Doctor: What’s wrong with y...

Doctor: What’s wrong with your brother?
Boy: He thinks he is a chicken.
Doctor: really? How long has this been going on?
Boy: Five years.
Doctor: Five years!
Boy: We would have brought him in earlier, but we needed the eggs.

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John Mayow

In 1641, John Mayow, an English chemist and physiologist, was baptized. His birth date is uncertain. Mayow is known for his studies of the relationships of atmospheric composition, combustion, and respiration. He noted both combustion and respiration use up only a small proportion of the available air. This he called spiritus nitro-aerous, which supported life and combustion (sometimes considered as discovery of oxygen.) The remainder of the air, he showed, does not support life, extinguishes a lighted candle and is insoluble in water. Mayow suggested that respiration is the source of animal heat, and that the foetus breathes through the placenta. He described the muscular actions around the chest cavity that are involved in respiration.

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