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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Bilingualism in the United States Bilingualism in the United States
Cartoon of Uncle Sam teaching states in Puck Cartoon of Uncle Sam teaching states in Puck
Sumatran Tiger Fewer than 400, Indonesia and Texas Ocelot Fewer than 250, southern United States, ... Sumatran Tiger Fewer than 400, Indonesia and Texas Ocelot Fewer than 250, southern United States, ...
Leading Sites of Cancer Deaths in the United States, 2013 Leading Sites of Cancer Deaths in the United States, 2013
Gypsy moths native to Europe and Asia feed on oaks through much of the United States. Gypsy moths native to Europe and Asia feed on oaks through much of the United States.
Remote satellite monitoring of gross primary productivity across the United States. The differences Remote satellite monitoring of gross primary productivity across the United States. The differences
Video: What are the Parts of a Plant Cell?

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