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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.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

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
This chart illustrates the four quadrants in which we can place the relationships between the state This chart illustrates the four quadrants in which we can place the relationships between the state
Schools are a primary agent of socialization. One of their functions is to teach children the ... Schools are a primary agent of socialization. One of their functions is to teach children the ...
In middle childhood, children spend increasing amounts of time with peers and friends. In middle childhood, children spend increasing amounts of time with peers and friends.
Aggressive and disruptive children are often not well-liked by peers and can be rejected or excluded ... Aggressive and disruptive children are often not well-liked by peers and can be rejected or excluded ...
Cognitive Development of Children (2 of 4) Cognitive Development of Children (2 of 4)
Video: Vascular tissues in a corn stem and a buttercup root

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