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Did you know?

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.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

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.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

Erythrocytes (red blood cells) moving through a capillary in single file. Erythrocytes (red blood cells) moving through a capillary in single file.
Hydrogen Bonding and the Properties of Water Hydrogen Bonding and the Properties of Water
Middle adulthood can bring large-scale changes in lifestyle and interests, as illustrated by this ph Middle adulthood can bring large-scale changes in lifestyle and interests, as illustrated by this ph
Properties of Air Masses Properties of Air Masses
Aromatherapy diffuser. The warmth of the candle releases the properties in the essential oils. Aromatherapy diffuser. The warmth of the candle releases the properties in the essential oils.
Nonmetal Oxides and Their Properties Nonmetal Oxides and Their Properties
Video: Hershey Chase Experiments

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