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Antiphon

Antiphon (Greek anti-– against; opposite property, action, situation + Greek phone – a sound) – in hygiene the individual means protecting from noise in the form of the earphones covering auricles.

 
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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.