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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

African lions are highly social predators. African lions are highly social predators.
Plains zebra are highly dependent on water. Plains zebra are highly dependent on water.
The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig
A highly sulfated glycosaminoglycan is heparin A highly sulfated glycosaminoglycan is heparin
Individuals from highly divergent lines created by artificial selection Individuals from highly divergent lines created by artificial selection
Video: What Are Carbohydrates? Importance of Carbs & High Carb Food

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