John puts one toe into he swimming pool and shivers because the water is so cold. he grits his teeth and dives in anyway. after about ten minutes, the temperature of the water seems quite comfortable to him. this example illustrates the principle of

This example illustrates the principle of "sensory adaptation".

Sensory adaptation is characterized as the decreased sensitivity to a stimulus as a result of consistent presentation to that upgrade. Brain  cells start to flame when they get on another upgrade in your condition as motioned by your tactile organs (your ears, eyes, nose, etc.).The consistent loud sound of a running forced air system, for example, appears to be disturbing when it is first turned on. Be that as it may, inside 60 minutes, you'll in all likelihood have overlooked that sound and never again see it. Along these lines, if that stimulus stays unaltered in the earth, at that point the mind cells start to flame altogether less in light of that stimulus, and the outcome is an absence of regard for that specific stimulus.  

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

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