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Caffeine has been used in a variety of medications to produce what?

The diuretic effects of caffeine have led to its use in what type of medication?

Amphetamines are synthetic stimulants.

About how many Americans suffer premature deaths related to smoking every year?

Lung cancer is the leading major cancer-related cause of death among women.

Cocaine enhances athletic performance involving strength or endurance.

One explanation for why high latitude locations receive less insolation is that it must travel through more of the atmosphere.  Because of this, there is a greater likelihood that the insolation will be scattered, reflected or absorbed by the material in the atmosphere.

The greatest portion of insolation that enters into the earth’s system, is absorbed at the surface.

Infrared EMR is what causes sunburns in humans.

_______ refers to the vertical flow of energy.