Kim Ann Zimmermann

The skin is the body's largest organ and performs many vital functions.

People with generalized anxiety disorder experience constant feelings of anxiety that affect their everyday life.

Reference Nearly every region of the world has influenced the customs and traditions of the United States.

Reference Al Gore didn't invent the Internet. Vinton Cerf & Bob Kahn are often called Fathers of the Internet.

Reference The network of nerves is the body's electrical wiring.

Reference "The birds and the bees" is a story parents tell their children to deflect the question "Where do babies come from?" The phrase refers to the talk about sex.

The Pleistocene epoch lasted from about 2.6 million to 11,700 years ago and included the last ice age, when glaciers and giant megafauna dominated the landscape.

Reference India is one of the world's oldest and most diverse cultures. Here is an overview of Indian customs and traditions.

Reference Mexican culture varies widely throughout the country, but traditions are highly valued as is its long and storied history.

Reference The lymphatic system helps rid the body of toxins. Diseases of this system include lymphadenopathy, lymphoma and other disorders.

Reference Discover the world of French culture, the customs and traditions of France, as well as how it became a center of fashion, art and architecture.

REFERENCE Italian culture goes back to the ancient, had a massive impact on the Renaissance and is represented in the world today by its art, fashion and popular food.

Facts and information about the endocrine system.

The heart, lungs and about 60,000 miles of blood vessels work together to keep blood pumping through our bodies.

Humans wouldn't get very far without bones — literally.

Social anxiety disorder causes significant discomfort about social interactions.

Sometimes, at sunset, the sun appears to suddenly and briefly change color. Blink, and you'll miss it.

Skin is the body's largest organ and is the first line of defense against harm.

The job of the immune system is to protect against disease.

This may be the most important system in the body. Without the ability to reproduce, a species dies.

The urinary system — also known as the renal system — produces, stores and eliminates urine, the fluid waste excreted by the kidneys

Chinese culture reflects the customs and traditions of one of the largest countries in the world, with 1.34 billion people.