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States of Matter: Plasma

May 05, 2016 | Reference

Plasma is a state of matter that is similar to gas, but the atomic particles are charged rather than neutral.
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Precambrian: Facts About the Beginning of Time

May 03, 2016 | Reference

The Precambrian was the first super eon of Earth’s history, lasting from about 4.6 billion to 542 million years ago.
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Esophagus: Facts, Functions & Diseases

May 03, 2016 | Reference

The esophagus is a tube that connects the throat (pharynx) and the stomach. Within it, muscles contract to move food to the stomach.
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Tomatoes: Health Benefits & Nutrition Facts

April 30, 2016 | Reference

Tomatoes are healthful as well as tasty and versatile. They are especially lauded for their cardiovascular benefits.
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Grapes: Health Benefits & Nutrition Facts

April 28, 2016 | Reference

Grapes are versatile fruits used in a wide range of popular foods. They are also packed with nutrients and antioxidants.
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Whiplash: Symptoms & Treatment

April 27, 2016 | Reference

Whiplash is a neck injury that is common in car crashes, but it can also be caused during other types of accidents. In the United States, over 2 million people suffer from whiplash each year.
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Brain Hemorrhage: Causes, Symptoms & Treatment

April 22, 2016 | Reference

A brain hemorrhage is bleeding in or around the brain. Brain hemorrhages occur when an artery in the brain bursts.
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Bedwetting: Causes & Treatment

April 20, 2016 | Reference

Bedwetting is common among young children. If it continues past age 7, there may be an underlying problem, and medical attention is recommended.
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Tornado Facts: Causes, Formation & Safety

April 19, 2016 | Reference

These violent storms wreak havoc and cost lives. They can occur anywhere at any time.
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Grizzly Bear Facts

April 18, 2016 | Reference

Grizzly bears are a type of brown bear that lives in the Pacific Northwest of the United States, Canada and Alaska.
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