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From Scientific American:
During a 24-hour period humans experience a rise and dip in the production of most hormones and neurotransmitters (the chemicals that relay signals between nerve cells). This daily cycle is referred to as the body's circadian rhythm and is regulated by both internal systems and external stimuli, the most powerful of which is visible light.
In an effort to gauge exactly how light affects our body clocks, Rensselaer Polytechnic Institute's Lighting Research Center (LRC) in Troy, N.Y., has developed a device called a Daysimeter.
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