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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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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Psoriasis. This photograph demonstrates the characteristic white skin patches of this condition. Psoriasis. This photograph demonstrates the characteristic white skin patches of this condition.
Benign prostatic hyperplasia. The condition results when an inner capsule of nonfunctional prostate Benign prostatic hyperplasia. The condition results when an inner capsule of nonfunctional prostate
Hematuria. An analysis of urine is performed to evaluate kidney function. In this illustration, the Hematuria. An analysis of urine is performed to evaluate kidney function. In this illustration, the
Intussusception. The condition is caused by an infolding of the small intestine, which often causes Intussusception. The condition is caused by an infolding of the small intestine, which often causes
Testing for Homans’ sign Testing for Homans’ sign
Retroauricular Ecchymosis (Battle's Sign) Retroauricular Ecchymosis (Battle's Sign)
Video: Enzyme-Catalyzed Reactions

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