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Colourless interval

Colourless interval (English interval from armor. intervallum, inter – between, vallus – a ditch; synonyms: a photochromatic interval, an achromatic interval) – the relation of values of thresholds tsveto-and photoperceptions, expressed as a difference of their logarithms.

 
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Even if heart of the person does not fight, then he all the same can live during a long period, as the Norwegian fisherman Jan Revsdal showed us. Its "motor" stopped for 4 hours after the fisherman got lost and fell asleep in snow.