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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?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Medication errors are three times higher among children and infants than with adults.
Did you know?
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.