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Diseases are polyetiological

Diseases polyetiological (Greek poly – is a lot of, English etiology – an origin, the reason) – the diseases developing owing to influence of factors, various on the essence (for example, pneumonia – a polyetiological disease as it can develop as a result of hit of liquid in respiratory tracts, or their infection, or for many other reasons); there is a disputable judgment that existence of polyetiological diseases is false.

 
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In operating time our brain spends the amount of energy equal to the 10 Watts bulb. So the image of a bulb over the head at the time of emergence of an interesting thought is not so far from the truth.