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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

The dorsal fin and saddle patch of a resident killer whale in the northeastern Pacific Ocean. It may The dorsal fin and saddle patch of a resident killer whale in the northeastern Pacific Ocean. It may
Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision
How a catalyst circumvents unfavorable charge development during cleavage of an amide How a catalyst circumvents unfavorable charge development during cleavage of an amide
The sense of taste. Note: taste buds are located on the anterior and posterior portions of the ... The sense of taste. Note: taste buds are located on the anterior and posterior portions of the ...
Processes of Lightning Formation: Charge Separation Processes of Lightning Formation: Charge Separation
A pedigree for albinism collected in the early years of the twentieth century by Charles Davenport, A pedigree for albinism collected in the early years of the twentieth century by Charles Davenport,
Video: DNA Replication

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