Skin Pigmentation Disorders

this entry of an encyclopedia is gives information about skin pigmentation disorders 

Pigmentation means coloring. Skin pigmentation disorders affect the color of your skin. Your skin gets its color from a pigment called melanin. Special cells in the skin make melanin. When these cells become damaged or unhealthy, it affects melanin production. Some pigmentation disorders affect just patches of skin.If your body makes too much melanin, your skin gets darker.If your body makes too little melanin, your skin gets lighter. 

How does the caffeine in coffee affect the body?

It only takes about 45 minutes for 99% of the drink's caffeine to be absorbed through these membranes/organs. In humans, the half-life for caffeine is anywhere from 4 to 6 hours on average, which explains why the average energy drink or coffee's effects last about 4 to 6 hours.

This bar graph shows the percentage of drinking coffee in different state and territories

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          This  is explaining that Americans people and scientists has different opinion about causes 

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