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Most cases of insomnia are related to poor sleeping habits, depression, anxiety, lack of exercise, chronic illness or certain medication.

Plasma is the clear, straw-colored liquid portion of blood that remains after red blood cells, white blood cells, platelets and other cellular components are removed. It is the single largest component of human blood, comprising about 55 percent, and contains water, salts, enzymes, antibodies and other proteins.

The path that the Moon’s shadow traces on Earth during a total solar eclipse is known as the Path of Totality.

The acid and alkaline death points are approximately pH 4 & pH 11 respectively.

Dissolved oxygen (DO) is the amount of oxygen that is present in water.
If the temperature of the sewage is more, DO content is less.
Saturated DO content at 20? is 9.2 ppm.
The Winkler’s Method is a technique used to measure dissolved oxygen in freshwater systems.
Higher dissolvedoxygen concentrations are correlated with high productivity & little pollution.

Electrooculography (EOG/E.O.G.) is a technique for measuring the corneo-retinal standing potential that exists between the front and the back of the human eye. The resulting signal is called the electrooculogram.

The phenomenon of total internal reflection of light is used in many optical instruments like telescopes, microscopes, binoculars, spectroscopes, periscopes etc.
Total internal reflection is also used in optical fibres.

Polysomnography, a type of sleep study, is a multi-parametric test used in the study of sleep and as a diagnostic tool in sleep medicine. The test result is called a polysomnogram, also abbreviated PSG.

Photoelectric cell is a device which uses photoelectric effect to generate current.
The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light.
Photoelectric effect is most commonly found in solar panels.

The scientific field of oneirology is the scientific study of dreams.

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